Upton, Martin. <br/><br/>
Agricultural Production Economics and Resource-Use /  

 - 1st ed /  
 - London W.1 :   Oxford University Press ,   1981 
 - p357 :  
<br/><br/><label>ISBN: </label>0-19-859459-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics 
<br/><br/><label>Dewey Class. No.: </label>X8(J):27  / L6