Sharp, CH.. <br/><br/>
Macmillan Studies in Economics: Transport Economics /  

 - 1st ed /  
 - London :   Macmillan Press Ltd. ,   1985 
 - p.80 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transportation
<br/><br/><label>Dewey Class. No.: </label>X4  / L3S