Greenberg, Jerald
Pearson, Prentice Hall, 2008
Buku Teks
Starr, Cecie
Brooks/Cole , 2001
Buku Teks
Vecchio, Robert P.
Dryden Press, 1995
Buku Teks
Carlson, Neil R.
Pearson/Allyn & Bacon, 2007
Buku Teks
Fouraker, Lawrence E.
McGraw-Hill, 1963
Buku Teks