Lawrence L. Bethel ... [et al.]
McGraw-Hill, 1954
Buku Teks
Zwerman, William L
Greenwood Publishing Corporation, 1970
Buku Teks
Ott, J. Steven, author
Wadsworth and Cengage Learning, 2011
Buku Teks
Seckler-Hudson, Catheryn, author
Washington, D.C., The American University Press
Buku Teks
Brown, Alvin
Prentice-Hall, 1947
Buku Teks