Hall, Kermit L., author
Oxford University Press, 1991
Buku Teks
Hendrix, Jerry A, author
Wadsworth and Cengage Learning, 2007
Buku Teks
Hendrix, Jerry A., author
Wadsworth, 2001
Buku Teks
Ginn Custom, 1985
Buku Teks
Cummings, Milton C.
Harcourt Brace Jovanovich, 1981
Buku Teks