Ridley John. <br/><br/>
Safety at Work 
John Ridley 
 - 4th ed. 
 - London:  Butter worth,  c 1994. 
 - 794 p . : 
<br/><br/><label>ISBN: </label>0750607467 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Safety at work--Industrial safety.
<br/><br/><label>Dewey Class. No.: </label>363.11 JOH