Schoorl, J.W.
KITLV Press, 1993
Buku Teks
Laitin, David D., author
The University of Chicago Press, 1986
Buku Teks
Carr, Patricia A.
American Society for Training & Development, 2006
eBooks
editor, Wiendu Nuryanti
Gadjah Mada University Press , 1996
Buku Referensi
by Janice McLaughlin, Paul Rosen, David Skinner and Andrew Webster
Routledge, 1999
Buku Teks