Swedroe, Larry E., author
Mc Graw-Hill, 2012
Buku Teks
Albright, Mary
Prentice-Hall, 1997
Buku Teks
Miller, William, author
American Management Association, 2009
eBooks
Sjodin,Terri L., author
Elex Media Komputindo, 2007
Buku Teks
Courtis, John
Arcan , 1992
Buku Teks