TY  - BOOK
AU  - Herrlich Horst
AU  -  Strecker George E
TI  - Category theory: An introduction
T2  - Allyn and Bacon series in advanced mathematics
U1  - B25, L34 
PY  - 1973///
CY  - Boston
PB  - Allyn and Bacon       
KW  - Higher algebra
ER  -