Gregory, Robert H. <br/><br/>
Automatic data-processing systems  Principles and Procedures 
by Robert H. Gregory and Richard L. Van Horn. 
 - 2nd ed. 
 - Belmont, California  Wadsworth Publishing Company.  1963 
 - ix, 816p. 
<br/><br/><label>LCCN: </label>63-15504 
<br/><br/><label>Dewey Class. No.: </label>001.63  / N633