Dominiak, Geraldine F., author
PWS-Kent, 1991
Buku Teks
Moore, Carl L., author
South-Western Publishing, 1976
Buku Teks
Moore, Carl L., author
South-Western Publishing, 1984
Buku Teks
Anderson, Lane K., author
South-Western Publishing, 1992
Buku Teks
Pyle, William W., author
Richard D. Irwin, 1980
Buku Teks