Oran, Daniel
West Publishing Co., 1975
Buku Teks
Oran, Daniel
West Publishing Company, 1983
Buku Teks
Fox, James R., author
Oceana Publications, Inc, 1992
Buku Teks
Ivamy, E.R. Hardy, author
Butterworth, 1988
Buku Referensi
Fox, James R., author
Oceana Publication, 1992
Buku Referensi