Jeston, John, author
Routledge, 2014
Buku Teks
by Curtis E. Tate Jr. ... [and others]
Business Publication, 1982
Buku Teks
Dersal, William R. Van
Harper & Brother, 1962
Buku Teks
Forsyth, Patrick, author
Institution of Engineering and Technology, 2008
eBooks
Phillips, Patricia Pulliam, author
American Society for Training & Development, 2012
eBooks