Long, Larry E., author
Prentice-Hall, 1994
Buku Teks
Mandell, Steven L., author
West Publishing, 1982
Buku Teks
Edwards, Perry, author
Wadsworth, 1979
Buku Teks
Rosenberg, Jerry M., author
John Wiley & Sons, 1987
Buku Referensi
Davis, William S., author
Addison-Wesley, 1981
Buku Teks