MacDonald, Charles R.
McGraw-Hill, 1982
Buku Teks
Leeb, Stephen, author
Business Plus, 2009
Buku Teks
Albright, Madeleine, author
Harper Perenial, 2008
Buku Teks
Groopman, Jerome, author
Pocket Books, 2004
Buku Teks
Stout, Linda, author
Berrett-Koehler, 2011
Buku Teks