New York St. Martin's Press 1992,
Buku Teks
edited by Stephen White, Judy Batt and Paul G. Lewiss
Macmillan, 1993
Buku Teks
Black C.E.
Rutgers Univ. Press, 1954, 1954
Buku Teks
Skilling, Gordon H., author
Thomas Y. Crowell, 1966
Buku Teks
Robbins, Peter T., editor
Springer, 2011
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