University Park Press, 1974
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
Glick, David, author
Appleton & lange , 1995
Buku Teks