Veeraraghavan, Vimala
Sage, 2002
Buku Teks SO
edited by Harold Leitenberg
Prentice-Hall, 1976
Buku Teks SO
edited by Samuel M. Turner, Karen S. Calhoun, Henry E. Adams
John Wiley & Sons, 1992
Buku Referensi
edited by Michel Hersen and Vincent B. van Hasselt
John Wiley & Sons, 1987
Buku Teks SO
Watson, David L.
Brooks/Cole , 1985
Buku Teks SO