Argenti, John, author
Allen & Unwin, 1975
Buku Teks
Cohen, William A., author
American Management Association, 2008
eBooks
Deverell, C.S., author
London, Gee & Co
Buku Teks
Jennings, Eugene E., author
Harper & Row, 1962
Buku Teks
Levinson, Harry, author
Harvard University Press, 1971
Buku Teks