Zimmerer, Thomas W.
Prentice-Hall, 2002
Buku Teks
Schollhammer, Hans
John Wiley & Sons, 1979
Buku Teks
Siropolis, Nicholas C.
Houghton Miffiln, 1977
Buku Teks
edited by Kenneth D. Lawrence, Ronald K. Klimberg
Emerald, 2016
eBooks
Hisrich, Robert D.
McGraw-Hill, 2014
Buku Teks