Gray, Richard, 1944-
American poetry of the twentieth century
Longman, 1991
 Buku Teks SO
Dembo, L.S.
Conceptions of reality in modern American poetry
University of California Press, 1966
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Stepanchev, Stephen
American poetry since 1945 : a critical survey
Harper and Row, 1965
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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
 Buku Teks SO