Entrepreneur Press, Cheryl Kimball
Entepreneur Press, 2011
Buku Teks
Greene, Gardiner G., author
McGraw-Hill, 1975
Buku Teks
Entrepreneur Press Rich Mintzer
Entepreneur Press, 2011
Buku Teks
Allen, Judy, author
Wiley, 2003
Buku Teks
Johnson, Luke, author
Penguin book, 2013
Buku Teks