QM an introduction to Quantitative methods for Business applications / 
Eck,R.D. 
 - Belmont, California :  Wadsworth Pub Co., Inc.  1979. 
 - xiii, 539 p,:  ill.; 
<br/><br/><label>ISBN: </label>0534006256 
<br/><br/><label>LC Class. No.: </label>HD30.25  / .E27  1979