National intelligence service needs to be free of political influences
 Artikel Jurnal
Lane, Max
Decentralization & its discontents: an essay on class, political agency, and national perspective in Indonesian politics
Institute of Southeast Asian Studies , 2014
 eBooks
Hawley, Amos H.
Human ecology : a theoretical essay
The University of Chicago Press, 1986
 Buku Teks
Locke, John
An essay concerning human understanding
Hackett Publishing Company, Inc., 1996
 Buku Teks
Locke, John
An essay concerning human understanding
J.M. Dent & Sons, 1947
 Buku Teks