Pring, Martin J., author
McGraw-Hill, 1981
Buku Teks
Phillips, Jack J., author
American Management Association;, 2005
eBooks
Gerken, Louis C., author
Wiley, 2014
Buku Teks
Trester, Kenneth R., author
McGraw-Hill, 2012
Buku Teks
Little, Ian M.D.
George Allen and Unwin, 1965
Buku Teks