Marcus, Marvin
Houghton Mifflin, 1970
Buku Teks
Cameron, Edward A.
Holt, Rinehart and Winston, 1965
Buku Teks
Larson, Ron, 1941-
D.C. Health, 1989
Buku Teks
Young, Cynthia Y.
John Wiley & Sons, Inc, 2007
Buku Teks
Nanney, J. Louis
Allyn and Bacon, 1980
Buku Teks