Artikel Jurnal
Gemma Stamina Kurniawan, author
Fakultas Teknik Universitas Indonesia, 2003
UI - Skripsi (Membership)
Thach, Elizabeth C., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks
Criscito, Pat, author
Barron's Educational Series, Inc., 1999
Buku Referensi
Artikel Jurnal