Maxima and minima without calculus 
Niven, Ivan Morton, 
 - [Washington, D.C.] :  Mathematical Association of America,  1981 
 - xv, 303 p. :  ill. ;  23 cm. 
 - The Dolciani mathematical expositions ;  no. 6 .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>088385306X