edited by Bruce W. Burkhart and Wesley S. Thompson
Burgess Publishing, 1972
Buku Teks
Norstog, Knut, author
Northern Illinois University, 1969
Buku Teks
by Horace D. Crockford [and others]
John Wiley & Sons, 1975
Buku Teks
Jones, Norris W., author
McGraw-Hill, 2001
Buku Teks
Cooper, Kenneth H., author
M. Evans and Com, 1968
Buku Teks