Lee, Grossman, author
Amacom, 1974
Buku Teks
Emerson, Tricia, author
American Society for Training & Development, 2011
eBooks
Dunphy, Dexter C., author
McGraw-Hill, 1985
Buku Teks
Stewart, Valerie, author
McGraw-Hill, 1983
Buku Teks
Helms-Mills, Jean, author
Routledge, 2009
Buku Teks