Roy, A. E <br/><br/>
Astronomy  principles and practice 
A. E. Roy and D. Clarke 
 - 4th ed. 
 - New Delhi  Nutech Photolithopraphers  2011 
 - xxiii, 475p. 
<br/><br/><label>ISBN: </label>0-7503-0917-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy principles<br/>Observation techniques
<br/><br/><label>Universal Decimal Class. No.: </label>52  / ROY