Barr, Michael. <br/><br/>
Acyclic models / 
Michael Barr. 
 - Providence, R.I. :  American Mathematical Society,  c2002. 
 - xi, 179 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0821828770 (pbk. : alk. paper) 
<br/><br/><label>Subjects--Index Terms: </label>Acyclic models 
<br/><br/><label>Universal Decimal Class. No.: </label>512.58  / BAR