Porterfield, John D.
Voice American Forum Lecture, [date of publication not identified]
Buku Teks
Shaffer, Thomas L.
West Publishing Company, 1976
Buku Teks
Seidel, Arthur H.
Ali ABA, 1993
Buku Teks
Binder, David A.
West Pub. Co.,, 1977
Buku Teks
Pressman, Andy
Wiley, 2006
Buku Teks