Rodiq, Oscar R., author
Fort Worth Saunders, 1990
Buku Teks
Martin, Stephen F., author
Brooks/Cole, Cengage Learning, 2011
Buku Teks
Adams, Roger, 1889-1971, author
McMillan, 1963
Buku Teks
Pasto, Daniel J., author
[Publisher not identified], 1992
Buku Teks
Ault, Addison, author
Houghton Mifflin, 1979
Buku Teks