Ibrahim Abdullah Assegaf
Mario Grafika, 1991
Buku Referensi
Estes, Ralph
Erlangga, 1994
Buku Referensi
Joel G. Siegel
N.Y Barron, 1995
Buku Referensi
Hansen, Don R.
South-Western College Publishing, 2000
Buku Teks
Chadwick, Leslie
Prentice-Hall, 1991
Buku Teks