edited by Peter Warr
Panguin Books, 1978
Buku Teks
Aamodt, Michael G., author
Wadsworth/Cengage Learning, 2013
Buku Teks
Maria C.W. Peeters, Jan de Jonge and Toon W. Taris, editors
Wiley-Blackwell, 2014
Buku Teks
Maddi, Salvatore R., author
AMACOM, 2005
Buku Teks
Leiter, Michael P., author
Jossey-Bass , 2005
Buku Teks