Walters, A.A. <br/><br/>
Costs and scale of bus services :  world bank staff working paper / 
A.A. Walters. 
 - Washington :  The World Bank,  1979. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microeconomics.<br/>Industrial organization (Economic theory).<br/>Production (Economic theory).