Shapiro, Stanley J.
New York Harper&Row 1974, 1974
Buku Teks
Dalrymple, Douglas J., author
John Wiley & Sons, 1983
Buku Teks
Gandhi, J.C.
McGraw-Hill Publishing Company, 1995
Buku Teks
Peter, J. Paul, author
McGraw-Hill, 2004
Buku Teks
Boyd, Harper W., Jr., author
New York, N.Y. , Harcourt Brace Jovanovich
Buku Teks