TY  - BOOK
AU  - Burley,Walter
AU  - Spade,Paul Vincent
TI  - On the purity of the art of logic: the shorter and the longer treatises 
SN  - 0300082002 :
U1  - 160 
PY  - 2000///
CY  - New Haven
PB  - Yale University Press
KW  - Logic, Medieval
N1  - Includes index; Bibliography:p.293-323
ER  -