Davison, Gerald C.
John Wiley & Sons, 1998
Buku Teks
edited by Anthony Gale, Michael W. Eysenck
John Wiley & Sons, 1992
Buku Referensi
Carlson, Neil R.
Pearson/Allyn & Bacon, 2007
Buku Teks
Carlson, Neil R.
Pearson-Prentice Hall, 2005
Buku Teks
Carlson, Neil R.
Allyn and Bacon, 2005
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