Savage, Donald T., author
John Wiley & Sons, 1977
Buku Teks
Kent, Raymond P., author
Holt, Rinehart & Winston, [Date of publication not identified]
Buku Teks
Kent, Raymond P., author
Holt, Rinehart & Winston, 1947
Buku Teks
Klise, Eugene S., author
South-Western College Publishing, 1972
Buku Teks
Kamerschen, David R., author
South-Western Publishing, 1992
Buku Teks