Sitter, Willem de.-Schaar, Jan Pieter van der. <br/><br/>
Kosmos 

 -  Amsterdam University Press  2009 
 - Amsterdam academic archive .
<br/><br/><label>ISBN: </label>9789089641540 
<br/><br/><label>Subjects--Topical Terms: </label><br/> History<br/>Astronomy--History.,Cosmology.<br/>SCIENCE