(arranged in order of comprehensiveness)
Preminger, Alex and T.V.F. Brogan, eds. The New Princeton Encyclopedia of Poetry and Poetics.
REF PN1021 .N39 1993
Spender, Stephen and Donald Hall, eds. The Concise Encyclopedia of English and American Poets and Poetry. (1963)
REF PR19 .S74
Perkins, David. A History of Modern Poetry: from the 1890's to the High Modernist Mode. (1976)
Perkins, David. A History of Modern Poetry: Modernism and After. (1987)
PS323.5 P46 1987t
Hamilton, Ian. Oxford Companion to Twentieth Century Poetry in English.
REF PR601 .O9 1994
Parini, Jay and Brett C. Miller, eds. The Columbia History of American Poetry.
PS303 .C64 1993t
Haralson, Eric L. and John Hollander, eds. Encyclopedia of American Poetry.
The Nineteenth Century
REF PS323.5.E53 2001
Whalley, George. Poetic Process. (1953)