Freedman, Paul <br/><br/>
Principles of scientific research 

 - Washington, D. C.:   Public Affairs Press,   1950 
 - xi, 222p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research and philosophy
<br/><br/><label>Subjects--Index Terms: </label>Economy of effort  Mental approach  Planning of research 
<br/><br/><label>Universal Decimal Class. No.: </label>D 001.8  / J0