Roy, A. E. <br/><br/>
Astronomy  Principles and practice / 

 - 4th ed. 
 - London :  Institute of Physics Publishing ,  2003, reprint.2011. 
 - xxiii+475 
<br/><br/><label>ISBN: </label>0750309172 
<br/><br/><label>Subjects--Index Terms: </label>Astronomy,mathematics