The HR Diagram / 
Edt. by H.N. Russell, A.G. Davis Phillip & D.S. Hayes. 
 - Dordrecht, Holland :  D. Reidel Publishing Company,  1978. 
 - 474 p. :  fig., photographs. 
<br/><br/>Includes Bibliographies and Indexes. 
<br/><br/><label>ISBN: </label>90-277-0905-X 90-277-0906-8 pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Աստղագիտություն