Nelson, John H.
Prentice-Hall, 1997
Buku Teks
Griffin & George, 1968
Buku Teks
Bauer, Richard C., author
Thomson, Brooks/Cole, 2005
Buku Teks
Robert, Julian L., author
W.H. Freeman, 1991
Buku Teks
Gershon J. Shugar ... [and others]
McGraw-Hill, 1981
Buku Referensi