Allen, Frederick Lewis
The big change : America transforms itself, 1900-1950
Harper & Row, 1952
 Buku Teks
Allen, Frederick Lewis
Perobahan Besar di Amerika Serikat =The big change : America transforms itself, 1900-1950
Endang, 1955
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Spiegel, Murray R.
Laplace transforms
McGraw-Hill , 1986
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Kennan, George F., 1904-
American diplomacy 1900-1950
The University of Chicago Press , 1953
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Bogan, Louise
Achievement in American poetry, 1900-1950
Henry Regnery, 1951
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