Agee, Warren Kendall, editor
Harper ,
Buku Teks
Wright, Charles Robert, author
Random House, 1975
Buku Teks
Dominick, Joseph R., author
McGraw-Hill, 1993
Buku Teks
Dominick, Joseph R., author
Random House, 1983
Buku Teks
Katzen, May
Unesco Press, 1975
Buku Teks