Robbins, Lionel. <br/><br/>
Essay on the Nature & Significance of Economic Science /  

 - Second Ed. /  
 - London :   Macmillan and Co. Ltd.. 
 - p160 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics 
<br/><br/><label>Dewey Class. No.: </label>X  / G5