Petersen, James F., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Muller, Robert A., author
Random House, 1978
Buku Teks
Craghan, Michael, author
John Wiley & Sons, 2003
Buku Teks
Gabler, Robert E., author
Thomson , 2004
Buku Teks
Newbigin, Marion I.
Dent & sons, Ltd., 1925
Buku Teks