Levy, David H.,  1948-. <br/><br/>
Observing variable stars :  a guide for the beginner / 
David H. Levy. 
 - Cambridge :  Cambridge University Press.,  1989. 
 - 198 pages :   illustrations ;   26 cm. 
<br/><br/><label>ISBN: </label>0521321131 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stars, Variable--Amateurs' manuals.