Phyrr, Peter A.
London: John & Wiley, 1973,
Buku Teks
Chen, Ching-chin
Oryx Press , 1980
Buku Teks
edited by Pamela S. Cenzer; Cynthia I. Gozzi
The Hawork Press , 1991
Buku Teks
Beirne, Mike
American Management Association, 2006
eBooks
Sulandari Harjono
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1981
UI - Skripsi (Membership)