Mason, Robert D. (Robert Deward),   1919-. <br/><br/>
Programmed learning aid for business and consumer mathematics / 
Robert D. Mason, Walter H. Lange, Temoleon G. Rousos coordinating editor Roger H. Hermanson. 
 - Homewood, Ill. :  Learning Systems Company,  1978. 
 - 142p. ;  26 cm. 
 - Irwin plaid series .
<br/><br/><label>ISBN: </label>0256012725 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business mathematics--Problems, exercises, etc.<br/>Business mathematics--Programmed instruction.