Paz, Mario
Van Nostrand Reinhold, 1986
Buku Teks
Williams, Alan
Kaplan Education, 2005
Buku Teks
edited by Edwin H. Gaylord, Jr., Charles N. Gaylord, James E. Stallmeyer.
McGraw-Hill, 1997
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Ratay, Robert T.
McGraw-Hill, 2010
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Connor, Jerome J.
Springer International Publishing, 2016
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