Cooper, Michael H., author
John Wiley & Sons, 1975
Buku Teks
Charns, Martin P., author
Prentice-Hall, 1983
Buku Teks
White, Kenneth R., author
AUPHA, 2010
Buku Teks
Collins, Charles, author
Oxford University Press, 1994
Buku Teks
Ozcan, Yasar A., author
Jossey- Bass, 2009
Buku Teks