Watzlawick, Paul
W.W. Norton & Company, 1974
Buku Teks SO
Robertson, S. Ian
Psychology Press, 2001
Buku Teks SO
Hodnett, Edward, editor
Harper & Brothers, 1955
Buku Teks SO
Fox, William M
Jossey Bass, 1987
Buku Teks
Briggs, William
Society for Industrial and Applied Mathematics, 2005
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