Owen, Terence C.
Marcel Dekker, 1969
Buku Teks
Creswell, Clifford J., author
ITB Press, 1982
Buku Teks
Leffler, John E.
Macmillan, 1973
Buku Teks
Seager, Spencer L., author
West Publishing Company, 1994
Buku Teks
Seager, Spencer L., author
Thomson Brooks/Cole, 2008
Buku Teks