Swokowski, Earl W.  1926 <br/><br/>
Fundamentals of trigonometry / 
Earl W. Swokowski 
 - 6th ed. 
 - Boston, Mass. :  PWS-Kent,  1986 
 - 367 p. :  ill. ;  24  cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>087150880X 
<br/><br/><label>LCCN: </label>85-24370 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry, Plane