Brown, Everett S.
Appleton-Century-Crofts, Inc., 1950
Buku Teks
Hirshberg, Herbert S.
American Library Association, 1947
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Walker, Edward Everett, 1900-1974
Charles Scribner's Sons, 1943
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MD : Bernan Press, 2004
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The America University, [date of publication not identified]
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