Khanna, O P <br/><br/>
Work study(time and motion study) : for engineering students 

 - rev. 
 - Delhi  Dhanpat Rai  1992 
 - 327p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management<br/>Time study -- Rating factor<br/>Work -- Quantification<br/>Work study -- Time-and-motion study<br/>Work-factor system