TY  - BOOK
AU  - Umbaugh, Bruce.,
TI  - On berkeley
T2  - Wadsworth philosophers series
SN  - 9788131507063
U1  - 192 UMB 
PY  - 2000///
CY  - New Delhi
PB  - Cengage Learning
N1  - Includes bibliographical references (p. 86-88)
ER  -