Hays, William L.
Holt, Rinehart and Winston, 1971
Buku Teks
Li, Jerome C.R., author
Edwards Brothers, 1964
Buku Teks
Billingsley, Patrick, author
Allyn and Bacon, 1986
Buku Teks
Huntsberger, David V., author
Allyn and Bacon, 1980
Buku Teks
Devore, Jay L..
Duxbury Press, 1995
Buku Teks