Harper, W.M. (William Massie)., <br/><br/>
Operational research 
W.M. Harper. 
 - London  The English Language Book Society and MacDonald Evans  1979. 
 - xv, 301pages. ;  18 cm. 
<br/><br/> First published in 1975. 
<br/><br/><label>ISBN: </label>071211534X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operations research