Johnson, Ken, author
John Wiley & Sons, 2004
Buku Teks
Polya, George, author
John Wiley & Sons, 1981
Buku Teks
Robertson, S. Ian, author
Psychology Press, 2001
Buku Teks
Fox, William M
Jossey Bass, 1987
Buku Teks
Briggs, William, author
Society for Industrial and Applied Mathematics, 2005
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