Baldwin, Ernest, author
Cambridge University Press, 1959
Buku Teks
by Emil L. Smith[and others]
McGraw-Hill, 1983
Buku Teks
Campbell, Mary K., author
Brooks/Cole Cengage Learning, 2008
Buku Teks
Garrett, R. (Reginald), author
Saunders College, 1995
Buku Teks
Mathews, Christopher K., author
Addison-Wesley, 2000
Buku Teks