Kaufmann, William J. <br/><br/>
Discovering the universe / 
William J. Kaufmann, III. 
 - 3rd ed. 
 - New York :  W.H. Freeman,  c1993. 
 - xiv, 420 p. :  ill. (some col.). 
<br/><br/><label>ISBN: </label>0716722968 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy.<br/>Cosmology.<br/>Expanding universe.