Fortenberry, John L., Jr., author
Jones & Bartlett Learning, 2011
Buku Teks
Raffel, Marshall W., author
Wiley, 1984
Buku Teks
Safian, Shelly C., author
Delmar, Cengage Learning, 2009
Buku Teks
Harrison, Carlene, author
Delmar Cengage Learning, 2013
Buku Teks
Gardenswartz, Lee
Jossey-Bass Publishers, 1998
Buku Teks