Bauer, Richard C., author
Thomson, Brooks/Cole, 2005
Buku Teks
Robert, Julian L., author
W.H. Freeman, 1991
Buku Teks
Cooper, Melanie M., author
McGraw-Hill, 2009
Buku Teks
Conroy, Lawrence E.
Macmillan, 1972
Buku Teks
Frantz, Harper W., author
W.H. Freeman, 1968
Buku Teks