Gillie, F.B., author
Mouton, 1971
Buku Teks
edited by Clara H. Greed
Routledge, 1999
Buku Teks
Greed, Clara H., author
Longman, 1994
Buku Teks
Russell, Lou, author
American Society for Training & Development, 2012
eBooks
Asia-Pacific Center, [date of publication not identified]
Buku Teks