Frisancho, A. Roberto
University of Michigan Press, 1990
Buku Referensi
World Health Organization, 1980
Buku Teks
Tobey, Deborah
[American Society for Training and Development Press;, ], 2005
eBooks
Kaufman, Roger
American Society for Training & Development, 2013
eBooks
Gibson, Rosalind S.
Oxford University Press , 1990
Buku Teks SO