TY  - BOOK
AU  - Lumsden Keith et al
TI  - Microeconomics :  A programmed book   
SN  - 0135813972
U1  - X:71, K6;M2 
PY  - 1982///
CY  - New Jersey 
PB  - Prentice Hall        
KW  - Microeconomics
ER  -