(1) Primary Texts.
Poems (1930; includes Paid on Both Sides as well as the great, early, cryptic lyrics); The Orators: An English Study (1932; an obscure politico-psychoanalytical description of sick England); The Dance of Death (1933; a masque about the death of the middle class); The Dog Beneath the Skin (1935; a play, co-authored with Isherwood); The Ascent of F6 (1936; a play, co-authored with Isherwood); Look, Stranger! (1936; in U.S. as On This Island, Auden’s preferred title); Spain (1937; a poem-pamphlet); Letters from Iceland (1937; travel book [?], co-authored with Louis MacNeice; includes Letter to Lord Byron); On the Frontier (1938; a play co-authored with Isherwood); Journey to a War (1939; travel book, co-authored with Isherwood); Another Time (1940; a volume taking new bearings, with elegies for Yeats and Freud, ‘Spain, 1937’ and ‘September 1, 1939).
The Auden poems are collected and annotated in The English Auden: Poems, Essays, and Dramatic Writings 1927-39, ed. Edward Mendelson (1977). Auden suppressed many of his earlier, more left-wing poems during his American period, and they are not included in his standard Collected Poems. The plays are available in paperback, or in W.H. Auden and Christopher Isherwood, Plays, ed. Edward Mendelson (1988). Letters from Iceland is a paperback, and is also in W.H. Auden, Prose, and Travel Books in Prose and Verse, ed. Edward Mendelson (1996).
For later Auden use the Collected Poems, ed. Edward Mendelson (1976, etc.)
(2) Secondary Material.
The important contemporary responses to Auden are collected in John Haffenden (ed.), Auden: The Critical Heritage (1983) - especially the pieces by Spender (23;66), Leavis (26;54;Day-Lewis (29), Isherwood (65), MacNeice (67), Grigson (68;79), and Rickword (70).
Randall Jarrell, ‘Changes of Attitude and Rhetoric in Auden’s Poetry’ (1941); and ‘Freud to Paul: The Stages of Auden’s Ideology’ (1945); both in Jarrell, The Third Book of Criticism (1969).
Chapter in John Bayley, The Romantic Survival: A Study in Poetic Evolution (1957)
Monroe K. Spears, The Poetry of W.H. Auden: The Disenchanted Island (1963)
Barbara Everett, Auden (1964)
Samuel Hynes, The Auden Generation: Literature and Politics in the 1930s (1976).
Stephen Spender, The Thirties and After: Poetry, Politics, People 1933-75 (1978).
Edward Mendelson, Early Auden (1981)
Edward Callan, Auden: A Carnival of Intellect (1983)
Stan Smith, W.H. Auden (1985)
Ronald Carter (ed.), Thirties Poets: ‘The Auden Group’: A Casebook (1984).
Edna Longley, Louis MacNeice. A Study (1988).
Valentine Cunningham, British Writers of the Thirties (1989).
Michael O’Neill and Gareth Reeves, Auden, MacNeice, Spender: The Thirties Poetry (1992).
Anthony Hecht, The Hidden Law: The Poetry of W.H. Auden (1993)
John Fuller, W.H. Auden: A Commentary (1998)
Edward Mendelson, Later Auden (1999).