Owler, L.W.J. Brown, J.L. <br/><br/>
Wheldon's Costing Simplified. 

 - 5th Ed. 
 - Plymouth :   English Language Book Society ; Macdonald & Evans,   1978 
 - ix, 322 p. 
<br/><br/><label>ISBN: </label>0712123334 
<br/><br/><label>Dewey Class. No.: </label>658.1  / OWL