Altfest, Lewis J.
McGraw-Hill, 1992
Buku Teks
Batra, Ravi
Simon and Schuster , 1988
Buku Teks
Kiyosaki, Robert T., 1947-, author
Gramedia Pustaka Utama, 2003
Buku Teks
American Bar Association
Publications International, 1990
Buku Referensi
Lerner, Joel J., author
McGraw-Hill, 1985
Buku Teks