Lawler, Edward E., author
JOSSEY - BASS, 2008
Buku Teks
Pitts, Robert A., author
South-Western College Publishing, 2000
Buku Teks
David, Fred R.
Pearson, 2017
Buku Teks
Gamble, John, author
McGraw-Hill , 2015
Buku Teks
editor by Avinash Kapoor
Business Science Reference, an imprint of IGI Global,, 2014
Buku Referensi