Downs, Lisa J., author
American Society for Training & Development, 2008
eBooks
Anmol Publications PVT, 1999
Buku Teks
edited by M.D. Jitendra
Anmol Publications,
Buku Referensi
UNDP and ESCAP , 1987
Buku Teks
Shackelford, Bill, author
American Society for Training and Development Press;, 2004
eBooks