Glatthorn, Allan A.
Harper-Collins, 1987
Buku Teks
Lens, Sidney
Thomas Y Corwell , 1969
Buku Teks
Wasby, Stephen L.
Charles Scribner`s Sons, 1973
Buku Teks
editors, Frederick T.L. Leong, Wade E. Pickren, Mark M. Leach, Anthony J. Marsella
Springer, 2012
eBooks
Simon, Michael S.
McGraw-Hill, 1979
Buku Teks