Duah-Asante, D. Kofi, author
E & FN Spon, 1998
Buku Teks
Wentz, Charles A., author
McGraw-Hill, 1995
Buku Teks
LaGrega, Michael D., author
McGraw-Hill, 2001
Buku Teks
LaGrega, Michael D., author
McGraw-Hill, 1994
Buku Teks
Blackman, William C., author
CRC Lewis, 1996
Buku Teks