Farmer, Richard N., author
Wadsworth, 1969
Buku Teks
Madura, Jeff, author
South-Western College, 2001
Buku Teks
Cunningham, William H., author
South-Western, 1984
Buku Teks
Pride, William M., author
South Western Cengage Learning, 2012
Buku Teks
Glos, Raymond E., author
South-Western Publishing, 1947
Buku Teks