Courant, Richard,  1888- <br/><br/>
What is mathematics? :  an elementary approach to ideas and methods / 
by Richard Courant and Herbert Robbins 
 - Oxford :  Oxford University Press,  1941 
 - 521 p. :  ill. ;  23 cm. 
<br/><br/>Suggestions for further reading : p. 511- 514 
<br/><br/><label>ISBN: </label>0195025172 
<br/><br/><label>LCCN: </label>41-025632 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics