Ready, R.K.
McGraw-Hill, 1967
Buku Teks
Awaloedin Djamin, editor
Kompas, 2001
Buku Teks
New York : National Learning Corporation, [T.th.],
Buku Referensi
Cowart, Robert, author
IDG Books Worlwide, 1996
Buku Teks
Miller, Peter
Little, Brown and Company, 1983
Buku Teks