Hussey, David E., author
Pergamon Press, 1976
Buku Teks
edited by Michael C. Jensen and Clifford W. Smith
McGraw-Hill, 1984
Buku Teks
Damodaran, Aswath, author
John Wiley & Sons, 1997
Buku Teks
Purdy, Harry Leslie, author
Prentice-Hall, 1942
Buku Teks
Zausner, Martin.
Ronald Press Co, 1968
Buku Teks