Bittel, Lester Robert, author
McGraw-Hill, 1976
Buku Teks
edited by Vas Prabhu and Malcolm Baker
McGraw-Hill, 1986
Buku Teks
Joan Marques, Satinder Dhiman, editors
Springer International Publishing, 2017
eBooks
Dian Rahmasari, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
UI - Tesis Membership
Chevalier, Roger, author
American Management Association, 2007
eBooks