Universitas Indonesia, 2009
UI - Skripsi (Open)
Lewis, Lynn S., author
American Management Association, 2008
eBooks
Newstrom, John W., author
McGraw-Hill, 1995
Buku Teks
UNESCO, 1979
Buku Teks
Atwood, Christee Gabour, author
American Society for Training & Development, 2007
eBooks