ASTD Research Study
American Society for Training & Development, 2010
eBooks
Sarumpaet, Riris Kusumawati
Faculty of Humanities University of Indonesia, 2012
Artikel Jurnal
Kan, Katharine L.
[American Library association, American Library association], 2006
eBooks
Ireland, Lewis R.
Project Management Institute, 1991
Buku Teks
Lewis, Judith A., 1939-
Brooks/Cole, 2012
Buku Teks