Vaughan, Emmett J.
John Wiley & Sons, 2001
Buku Teks
Harrington, Scott E.
McGraw-Hill, 2004
Buku Teks
Harrington, Scott E.
McGraw-Hill, 2003
Buku Teks
Chin, Yee Wah
Pearson Prentice Hall, 2004
Buku Teks
edited by Barbara J. Youngberg
An Aspen, 1990
Buku Teks