Paul, Richard W.
Prentice-Hall, 2002
Buku Teks
Kemp, Jana, author
American Management Association, 2005
eBooks
Goldstein, Elisha, author
Atria Books, 2012
Buku Teks
Verhaeghen, Paul, author
Oxford University Press, 2017
eBooks
Rosenthal, Norman E., author
Citadel Press, 2002
Buku Teks