Conrad's literary criticism:
Conrad's Prefaces to His Works, with an introductory essay by Edward Garnett (1937) Joseph Conrad on Fiction, ed. Walter F. Wright (1964)

Selected Literary Criticism and The Shadow-Line, ed. Allan Ingram(1986).

Other valuable resources:
Joseph Conrad: Interviews and Recollections, ed. Martin Ray (1990)

Congo Diary and Other Uncollected Pieces by Joseph Conrad, ed.Zdzislaw Najder (1978).

Conrad's correspondence:
The Collected Letters of Joseph Conrad (1983-, five vols. to date).

Letters from Joseph Conrad, 1895-1924, ed. Edward Garnett (1928).

Conrad to a Friend, 150 Selected Letters from Joseph Conrad to Richard Curle, edited with an introduction and notes by Richard Curle (1928).

Letters of Joseph Conrad to Marguerite Poradowska, 1890-1920, translated from the French and edited, with an introduction, notes, an appendices, by John A. Gee and Paul J. Sturm (1940).

Letters to William Blackwood and David S. Meldrum, ed. William Blackburn (1958).

Joseph Conrad's Letters to R. B. Cunninghame Graham, ed. Cedric Watts (1969).

Books by Conrad's wife Jessie:
Joseph Conrad as I Knew Him (1926)

Joseph Conrad and His Circle (1935; 2nd ed., 1964).

Books by Conrad's sons:
Borys Conrad, My Father: Joseph Conrad (1970)

John Conrad: Joseph Conrad: Times Remembered (1981).

Also worth consulting:
Conrad under Familial Eyes: Texts, selected and edited by Zdzislaw Najder (1983); and Contexts for Conrad, ed. Keith Carabine, Owen Knowles,and Wieslaw Krajka (1993).
 

Secondary Sources

I. Brief introductions to Conrad's life and writings, and surveys of his literary career:
Douglas John Hewitt, Conrad: A Reassessment (2nd ed., 1969).

C. B. Cox, Joseph Conrad (1977).

Cedric Watts, A Preface to Conrad (1981; 2nd ed., 1993).

Adam Gillon, Joseph Conrad (Twayne English Author Series, 1982).

Carl D. Bennett, Joseph Conrad (1991).

Brian Spittles, Joseph Conrad: Text and Context (1992).

II. Biographies:
The standard biography is Zdzislaw Najder, Joseph Conrad: A Chronicle(1983). Also valuable are:

G. Jean-Aubry, Joseph Conrad, Life and Letters, 2 vols. (1927).

Jocelyn Baines, Joseph Conrad: A Critical Biography (1960).

Bernard C. Meyer, Joseph Conrad; A Psychoanalytic Biography (1967).

Roger Tennant, Joseph Conrad (1981).

Frederick R. Karl, Joseph Conrad: The Three Lives (1979).

Jeffrey Meyers, Joseph Conrad: A Biography (1991).

John Batchelor, The Life of Joseph Conrad: A Critical Biography (1994).

III. Collections of criticism:
The Art of Joseph Conrad: A Critical Symposium, ed. R. W.Stallman (1960).

Conrad: A Collection of Critical Essays, ed. Marvin Mudrick (1966).

Conrad: The Critical Heritage, ed. Norman Sherry (1973).

Joseph Conrad, ed. Harold Bloom (1986).

Critical Essays on Joseph Conrad, ed. Ted Billy. (1987).

Joseph Conrad: Third World Perspectives, ed. Robert D. Hamner (1990).Joseph Conrad, ed. Elaine Jordan (New Casebooks Series,1996).

IV. Selected Scholarly Studies (pre-1990):
F. R. Leavis, The Great Tradition (1948), on George Eliot, Henry James, Henry James, and Conrad.

Thomas C. Moser, Joseph Conrad: Achievement and Decline (1957).

Albert J. Guerard, Conrad the Novelist (1958).

Eloise Knapp Hay, The Political Novels of Joseph Conrad: A Critical (1963).

Edward W. Said, Joseph Conrad and the Fiction of Autobiography (1966).

Norman Sherry, Conrad's Eastern World (1966).

Avrom Fleishman, Conrad's Politics: Community and Anarchy in the Fiction of Joseph Conrad (1967).

James L. Guetti, The Limits of Metaphor: A Study of Melville,Conrad, and Faulkner (1967).

Norman Sherry: Conrad's Western World (1971).

John A. McClure, Kipling and Conrad: The Colonial Fiction (1981).

Ian Watt, Conrad in the Nineteenth Century (1981). Note: This book is often cited as the best critical study of the first half of Conrad's literary career.

Bonita Parry, Conrad and Imperialism: Ideological Boundaries and Visionary Frontiers (1983).

Aaron Fogel, Coercion to Speak: Conrad's Poetics of Dialogue (1985)

Vincent P. Pecora, Self and Form in Modern Narrative (1989), on Conrad, Henry James, (Conrad, Henry James, D. H. Lawrence)

V. Selected Scholarly studies (since 1990):
Jeremy Hawthorn, Joseph Conrad: Narrative Technique and Ideological Commitment (1990).

Bette Lynn London, The Appropriated Voice: Narrative Authority in Conrad, Forster, and Woolf (1990).

Richard Ambrosini, Conrad's Fiction as Critical Discourse (1991).

Daphna Erdinast-Vulcan, Joseph Conrad and the Modern Temper (1991).

Ruth L. Nadelhaft, Joseph Conrad (1991), a feminist interpretation.

R. G. Hampson, Joseph Conrad: Betrayal and Identity (1992).

Andrea White, Joseph Conrad and the Adventure Tradition:Constructing and Deconstructing the Imperial Subject (1993).

Adam Gillon, Joseph Conrad: Comparative Essays, ed. Raymond Brebach

(1994).

John W. Griffith, Joseph Conrad and the Anthropological Dilemma:>Bewildered Traveller (1995).

Christopher Lloyd GoGwilt, The Invention of the West: Joseph Conrad and the Double-Mapping of Europe and Empire (1995).

Geoffrey Galt Harpham, One of Us: The Mastery of Joseph Conrad (1996).

VI. For the Study of Heart of Darkness
Conrad's Heart of Darkness and the Critics, ed. Bruce Harkness(1960).

Heart of Darkness: Backgrounds and Criticisms, ed. Leonard F. Dean

(1960).

Todd K. Bender, A Concordance to Conrad's Heart of Darkness (1979).

Joseph Conrad's Heart of Darkness: Modern Critical Interpretations,ed. Harold Bloom (1987).

Heart of Darkness: A Case Study in Contemporary Criticism, ed. Ross C. Murfin (1989).

Gary Adelman, Heart of Darkness: Search for the Unconscious (1987).

Heart of Darkness: An Authoritative Text, Backgrounds and Sources,Criticism, ed. Robert Kimbrough (3rd ed., 1988).

Literary Theory at Work: Three Texts (Conrad, Henry James, D. H. Lawrence), ed. Douglas Tallack (1987).

For a vivid account of the controversies that arise in the classroom during discussions of Heart of Darkness, see David Denby, "Jungle Fever," The New Yorker, November 6, 1995, later included in Denby, Great Books (1996), chapter 27.

VII. Bibliographies:
Joseph Conrad at Mid-Century: Editions and Studies, 1895-1955,ed.

Kenneth A. Lohf and Eugene P. Sheehy (1957).

A Bibliography of Joseph Conrad, compiled by Theodore G. Ehrsam (1969).

Bruce E. Teets and Helmut E. Berger, Joseph Conrad: An Annotated Bibliography of Writings About Him (1971).

Joseph Conrad and American Writers: A Bibliographical Study of Affinities, Influences, and Relations, compiled by Robert Secor and Debra Moddelmog (1985).

Bruce E. Teets, Joseph Conrad: An Annotated Bibliography (1990).

Owen Knowles, An Annotated Critical Bibliography of Joseph Conrad(1992).

VIII. Additional Resources:

Frederick R. Karl, A Reader's Guide to Joseph Conrad (1960; 2nd ed.,1969).

Norman Page, A Conrad Companion (1986).

The Cambridge Companion to Joseph Conrad, ed. J. H. Stape (1996).

The journal Conradiana, founded in 1968, appears three times each year.
 
 

Conrad and film

A fascinating documentary is Hearts of Darkness: A Filmaker's Apocalypse (1991).

A general treatment of the subject: Gene D. Phillips, Conrad and Cinema: The Art of Adaptation (1995).

There is a film version of Heart of Darkness, directed by Nicolas Roeg, and starring Tim Roth as Marlow and John Malkovich as Kurtz (1994, Turner Pictures/Chris/Rose Productions).