Roy,A E. <br/><br/>
Astronomy :   Principles and Practice/ 
A E. Roy, & D.Clarke. 
 - 4th Ed. 
 - UK:  IOP,  c2003. 
 - xxiii,475p. 
<br/><br/><label>ISBN: </label>9780750309172 
<br/><br/><label>Dewey Class. No.: </label>520   / ROY/A