Comins, Neil F. <br/><br/>
Discovering the Universe / 
N.F. Comins , W.J. Kaufamnn. 
 - 5th ed. 
 - New York :  W.H. Freeman and Company,  2000. 
 - 480. 
<br/><br/><label>ISBN: </label>0716736373 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Աստղագիտություն<br/>Cosmology