Brown, Warren B., author
John Wiley & Sons, 1980
Buku Teks
Kast, Fremont Ellsworth, author
McGraw-Hill, 1979
Buku Teks
DeGreene, Kenyon B., author
John Wiley, 1982
Buku Teks
Seckler-Hudson, Catheryn, author
Washington, D.C., The American University Press
Buku Teks
Lawrence L. Bethel ... [et al.]
McGraw-Hill, 1945
Buku Teks