Freedman, Paul. <br/><br/>
The principles of scientific research. 

 - London  Macdonald & Co   1949 
 - ix, 228 p2  ill. 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research.
<br/><br/><label>Dewey Class. No.: </label>607  / FRE