Crabb, Peter R., author
McGraw-Hill, 2003
Buku Teks
Pessin, Allan H., author
Business One Irwin, 1990
Buku Referensi
Merrett, A.J., author
Longman , 1963
Buku Teks
Ripley, William Z.
Little, Brown, and Company, 1927
Buku Teks
Downes, John
Barron's Educational Series, 1998
Buku Referensi