Baldwin, Ernest, author
University Press, 1962
Buku Teks
Rastogi, S.C., author
Tata McGraw-Hill, 1995
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