An Introduction to Homological Algebra/ 
Rotman, Joseph 
 - 2nd.ed. 
 - New York:  Springer,  2009. 
 - 709 p. 
<br/><br/><label>ISBN: </label>9780387245270 
<br/><br/><label>Dewey Class. No.: </label>512.64  / ROT/I