Hubbard, L. Ron, 1911-1986
L. Ron Hubbard : a profile
Bridge Publications, Inc., 2012
 Buku Referensi
Horngren, Charles T., 1926-
Introduction to financial accounting / Charles T. Horngren, Gary L. Sundem and John a. Elliott
Prentice-Hall, 1996
 Buku Teks
Bierman, Harold
Strategic financial planning : a manager`s guide to improving profit performance
The Free Press, 1980
 Buku Teks
Machiavelli, Niccolo
Dear Prince : the unexpurgated counsels of N. Machiavelli to Richard/translate by Edward L. Greenfield & Charles L. Mee,jr Milhous Nixon / translated by Edward L. Greenfield &​ Charles L. Mee, Jr.
American Heritage Press, 1969.
 Buku Teks
Bullis, L. Harold
Strategic and critical materials / L. Harold Bullis and James E. Mielke
Westview Press, 1985
 Buku Teks