Warner, Attorney Ralph
Addison-Wesley, 1980
Buku Teks
Lane, Marc J.
John Wiley & Sons, 1982
Buku Teks
U.S. Small Business Administration , 1977
Buku Teks
Dickinson, Duo
McGraw-Hill, 1995
Buku Teks
Fox, Annette Baker, 1912-
The University of Chicago Press, 1959
Buku Teks