Check in Check out /  
Vallen Gary K. ; Vallen Jerome J. ; Robinson Gary F. 
 - Canadian edition 
 - Toronto :   Pearson Prentice-Hall ,  2004 
 - xiv , 480 p. ,   ill. ( some col.)  25 cm. 
<br/><br/><label>ISBN: </label>0130454206 
<br/><br/><label>LC Class. No.: </label>TX911.3  / .V34  2004