Christenson, Reo M.
Harper & Row Publishers, 1982
Buku Teks
Taylor, Verta, author
McGraw-Hill, 2009
Buku Teks
Cremo, Annette M., author
[American Society for Training and Development Press, American Society for Training and Development Press], 2001
eBooks
Hall, John Oliver, author
American Book Company, 1958
Buku Teks
Alexandre, Michele, 1975-, author
Routledge, 2015
Buku Teks