Robertson, Dennis H.. <br/><br/>
Lectures on Economic Principles /  

 - 1st ed /  
 - Bombay :   Asia Publishing House ,   1989 
 - p164 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics 
<br/><br/><label>Dewey Class. No.: </label>X  / K1;1