Ridpath, Ian, ed. <br/><br/>
Encyclopedia of astronomy and space 

 - London  Macmillan ltd.  1976 
 - 240p.; 28cm. 
<br/><br/><label>ISBN: </label>333213653 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy - encyclopedia<br/>Encyclopedia - astronomy