King, G. Brooks, author
American Book Company, 1963
Buku Teks
Cole, Robert E
University of California, 1971
Buku Teks
Ciresi, Rita
Delta Trade Paperbacks, 1996
Buku Teks
Fitzgerald, Penelope, author
Everyman's Library, 2001
Buku Teks
Langan, John, 1942-, author
McGraw-Hill , 2001
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