Kay, Judy, author
Addison-Wesley, 1989
Buku Teks
edited by David R. Barstow, Howard E. Shrobe and Erik Sandelwall
McGraw-Hill, 1984
Buku Teks
Karle, Elizabeth M., author
[American Management Association, ], 2009
eBooks
Caputo, Janette S., author
AZ Cry Press , 1991
Buku Teks
edited by Alphonse F. Trezza
G.K. Hall, 1990
Buku Teks