Gardner, Martin,  1914- <br/><br/>
Knotted doughnuts and other mathematical entertainments/ 
Martin Gardner. 
 - New York:  W.H. Freeman,  c1986. 
 - xii, 278 p.:  ill.;  24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0716717999 (pbk.) 0716717948 (hard) 
<br/><br/><label>LCCN: </label>85031134 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations.
<br/><br/><label>Dewey Class. No.: </label>510