Jefferklys, William H. <br/><br/>
Discovering astronomy   
by William H. Jefferys, R Robert Robbins 
 - New york  John Wiley & Sons  1981 
 - xi, 466p. 
<br/><br/><label>ISBN: </label>0471441252 
<br/><br/><label>LCCN: </label>80-22558 
<br/><br/><label>Dewey Class. No.: </label>520  / N81