R & R Newkirk/Longman, 1985
Buku Referensi
Morton, Gene A.
Fishergate, 1986
Buku Teks
Black, Kenneth, author
Prentice-Hall, 2000
Buku Teks
Ingrisano, John R., author
Chicago, Dearborn Financial Publishing, 1990
Buku Referensi
Black, Kenneth, author
Prentice-Hall, 1994
Buku Teks