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American Psychological Association, 1997
 Majalah, Jurnal, Buletin
Psychological Review
American Psychological Association, Inc.,, 2002
 Majalah, Jurnal, Buletin
Freeman, Frank S.
Theory and practice of psychological testing
Holt, Rinehart and Winston, 1960
 Buku Teks
Japanese Psychological Reserach
Blackwell Publishing,
 Majalah, Jurnal, Buletin
Cohen, John
Psychological probability or the art of doubt
George Allen and Unwin, 1972
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