Brown, Norman
Prentice-Hall, 1998
Buku Teks
Warner, Attorney Ralph, author
Addison-Wesley, 1980
Buku Teks
Lane, Marc J.
John Wiley & Sons, 1982
Buku Teks
U.S. Small Business Administration , 1977
Buku Teks
Dickinson, Duo, author
McGraw-Hill, 1995
Buku Teks