Conroy, Lawrence E.
Macmillan, 1972
Buku Teks
Robert, Julian L., author
W.H. Freeman, 1991
Buku Teks
Bauer, Richard C., author
Thomson, Brooks/Cole, 2005
Buku Teks
Sousa, John J., author
Rhode Island Consortium, 1990
Buku Teks
Beran, J.A., author
John Wiley & Sons, 2009
Buku Teks