Metzger, Norman, author
Aspen Publication, 1983
Buku Teks
Smyth, Terry, author
Macmillan, 1996
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Petersen, Donald J.
An Aspen Publication, 1981
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Menninger, William C., author
Science Research Associates , 1958
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Purnell, Larry D., author
F.A. Davis, 2005
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