Glatthorn, Allan A.
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
eBooks
Wasby, Stephen L.
Charles Scribner`s Sons, 1973
Buku Teks