Artikel Jurnal
Godwin, Jack, author
American Management Association, 2009
eBooks
Conason, Joe, author
Simon & Schuster, 2016
Buku Teks
Dony Hermawan, author
Program Pascasarjana Universitas Indonesia, 2005
UI - Tesis (Membership)
Situmorang, Gopokson Tarulitua, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2000
UI - Tesis (Membership)