Solso, Robert L., 1933-
Boston, 2002
Buku Teks
Kirk, Roger E.
Sage, 2013
Buku Teks SO
Myers, Anne
Wadsworth and Cengage Learning, 2012
Buku Teks
Winer, B.J.
McGraw-Hill, 1991
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Smith, Wendell F.
Society for Industrial and Applied Mathematics, 2005
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