Butler, S. T. and Messel, H. <br/><br/>
The Universe of Time and Space 

 - Oxford  Pergamon Press/The Macmillan Company  1963 
 - 291 
<br/><br/><label>Publisher. No.: </label> Higginbothams Bangalore 
<br/><br/><label>Subjects--Personal Names: </label> Astronomy 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy