Gray, Richard, 1944-
American poetry of the twentieth century
Longman, 1991
 Buku Teks SO
Bogan, Louise
Achievement in American poetry, 1900-1950
Henry Regnery, 1951
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Dembo, L.S.
Conceptions of reality in modern American poetry
University of California Press, 1966
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Poets on poetry
edited by Howard Nemerov
Basic Books, 1966
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Forrest-Thomson, Veronica
Poetic artifice : a theory of twentieth-century poetry
Manchester University Press, 1978
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