Carrell, Michael R., author
Irwin, 1984
Buku Teks
Werther, William B., author
McGraw-Hill, 1993
Buku Teks
Beach, Dale S., author
Macmillan, 1980
Buku Teks
Dessler, Gary, 1942-, author
Reston Publishing, 1978
Buku Teks
Jucius, Michael J.
Chicago, Ill Richard D. Irwin. Inc , 1949
Buku Teks