Pen, Jan  1921- <br/><br/>
Harmony and conflict in modern society / 
By J. Pen ; Translated from the Dutch by Trevor S. Preston. 
 - London [etc.] :  McGraw-Hill Pub. Co.,  [1966]. 
 - 294 p. 
<br/><br/>Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics