Hartkopf, Roy. <br/><br/>
Math without tears / 
Roy Hartkopf. 
 - New York :  Emerson Books,  1971. 
 - 247 p. :  ill. 
<br/><br/> Published in 1965 under title: Maths for those who hate it. 
<br/><br/><label>ISBN: </label>087523173X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Popular works.