Daniells, Lorna
University of California Press, 1985
Buku Referensi
Shubin, John A., author
Barnes & Noble, 1975
Buku Teks
Walthall, Wylie A., author
Harper and Row, 1987
Buku Teks
Bovee, Courtland L., author
Pearson/Prentice Hall, 2007
Buku Teks
Boone, Louis E., author
Dryden Press, 1996
Buku Teks