Reports of the Midwest category seminar IV 
Ed. S. Mac Lane 
 - Berlin; Heidelberg; New York  Springer  1970 
 - 139 p  ill  25 cm 
 - Lecture notes in mathematics  137 .
<br/><br/> Cuprinde bibliografie pe capitole 
<br/><br/><label>LCCN: </label>78126772