Simeonsson, Rune J., author
Allyn and Bacon, 1986
Buku Teks
Friedrich, William N., author
Sage Publications, 2001
Buku Teks
editor Ronald J. Prinz
Jessica Kingsley Publishers, 1991
Buku Referensi
Merrell, Kenneth W., author
Routledge, 2007
Buku Teks
Huberty, Thomas J., author
Springer, 2012
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