Gray, Richard O., <br/><br/>
Stellar Spectral Classification : 

 -  Princeton University Press,  2009. 
 - 611 pages 
<br/><br/><label>ISBN: </label>9780691125114 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science.
<br/><br/><label>Dewey Class. No.: </label>523.87  / GRA