Schiro, Michael Stephen, author
Sage Publications Ltd,, 2013
Buku Teks
Glatthorn, Allan A., author
Harper-Collins, 1987
Buku Teks
Lens, Sidney
Thomas Y Corwell , 1969
Buku Teks
Howard D.Samuel
Henry Holt and Company, 1953
Buku Teks
Frederick T.L. Leong, Wade E. Pickren, Mark M. Leach, Anthony J. Marsella, editors
[Springer, ], 2012
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