American Society for Training and Development Research
American Society for Training & Development, 2012
eBooks
Jardine, David W.
Routledge, 2008
Buku Teks
Europa Publications Limited, 1984
Buku Referensi
Iain Hay
McGraw-Hill , 2011
Buku Teks
Europa Publications Limited, 1993
Buku Referensi