Sukur, Silvester Goridus, author
Buku Teks
Gear, Jolene, author
Cambridge university press, 2010
Buku Teks
Sharpe, Pamela J., author
Barron's, 2001
Buku Teks
Sharpe, Pamela J.
Barron's Educational Series, 1995
Multimedia
Sharpe, Pamela J.
Barron's Educational Series, 1995
Multimedia