Halvorson, George C., author
John Wiley & Sons, 2007
Buku Teks
New York, N.Y. The Committee 1975, 1975
Buku Teks
Hetherington, Robert W.
John Wiley & Sons, 1975
Buku Teks
Andika Wirawan, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis Membership
Fuchs, Victor R.
Basic Books, 1974
Buku Teks