Hinkle, Charles L
Mc Graw Hill, 1975
Buku Teks
editor by Avinash Kapoor
Business Science Reference, an imprint of IGI Global,, 2014
Buku Referensi
by Roger A. Kerin ... [and others]
McGraw-Hill, 2002
Buku Teks
Etzel, Michael J.
McGraw-Hill, 2004
Buku Teks
Kurtz, David L.
The Dryden Press , 1981
Buku Teks