Zimbardo, Philip G.
Scott Floresman & Company , 1997
Buku Teks
Wigglesworth, V.B., author
Worth, 1964
Buku Teks
Bauman, Zygmunt, 1925-2017, author
Polity Press, 2005
Buku Teks
by the editors of Fortune
Doubleday, 1956
Buku Teks
Vaillant, George E., author
Little, Brown, 1977
Buku Teks