Jones, Stephanie
Headhunting : a guide to executive search in Asia / Stephanie Jones
Prentice-Hall, 1995
 Buku Teks
Locke, John
John Locke : an essay concerning human understanding in focus
Routledge, 2000
 Buku Referensi
Hanke, John E.
Understanding business statistics/ John E. Hanke
Illinois Irwin, 1994
 Buku Teks SO
Locke, John
An essay concerning human understanding
Hackett Publishing Company, Inc., 1996
 Buku Teks SO
Locke, John
An essay concerning human understanding
J.M. Dent & Sons, 1947
 Buku Teks SO