TY  - BOOK
AU  - Entelek
AU  -  Herrnstadt Irwin
TI  - Supply and demand. 2V
T2  - Programmed Instruction in Economics
U1  - X:73, K3.1-.2 
PY  - 1997///
CY  - New York
PB  - The Macmillan Company       
KW  -  Economics
KW  - Supply and Demand
ER  -