Tompkins, Jonathan R., author
Wadsworth, 2005
Buku Teks
Seckler-Hudson, Catheryn, author
Washington, D.C., The American University Press
Buku Teks
Brown, Warren B., author
John Wiley & Sons, 1980
Buku Teks
Rice, A K
Tavistock Publications, 1963
Buku Teks
Shortell, Stephen M. (Stephen Michael), 1944-, author
John Wiley & Sons, 1983
Buku Teks