Artikel Jurnal
Hunter, Wilson William, author
Clarendon Press, 1903
Buku Teks
Sri Dwi Astuti, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2008
UI - Skripsi (Open)
Giere, Nancy M., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2000
eBooks
Lucas, Robert W., author
American Management Association, 2001
eBooks