Frisancho, A. Roberto
University of Michigan Press, 1990
Buku Referensi
World Health Organization, 1980
Buku Teks
Gibson, Rosalind S.
Oxford University Press , 1990
Buku Teks
McGoldrick, Beth
ATD Press, 2016
Buku Teks
Tobey, Deborah
[American Society for Training and Development Press;, ], 2005
eBooks