Ford, William
Lexington D.C. Heath and Co., 1988
Buku Teks
Iverson, Kenneth E., author
John Wiley & Sons, 1962
Buku Teks
Donovan, John J., author
McGraw-Hill, 1972
Buku Teks
Katzan, Harry, Jr., author
Van Nostrand Reinhold , 1970
Buku Teks
Markowitz, Harry M., author
Prentice-Hall, 1963
Buku Teks