Mandell, Steven L., author
West Publishing Company, 1982
Buku Teks
Sanders, Donald H., author
McGraw-Hill, 1983
Buku Teks
Chandor, Anthony.
Penguin, 1985
Buku Referensi
Gore, Marvin R., author
McGraw-Hill, 1984
Buku Teks
Chapin, Ned, author
Van Nostrand Reinhold , 1971
Buku Teks