Robinson, Paul W., 1942-
Prentice-Hall, 1981
Buku Teks
Solso, Robert L., 1933-
Boston, 2002
Buku Teks
Kirk, Roger E
Sage Publications, 2013
Buku Teks
Myers, Anne
Wadsworth and Cengage Learning, 2012
Buku Teks
Smith, Wendell F.
Society for Industrial and Applied Mathematics, 2005
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