McLarney, William J., author
Richard D. Irwin, 1961
Buku Teks
Hoogendoorn, J., author
UI-Press, 1989.
Buku Teks
Cohen, William A., author
American Management Association, 2008
eBooks
Deverell, C.S., author
London, Gee & Co
Buku Teks
Sri Purwaningsih, author
2017
UI - Skripsi (Membership)