TY  - BOOK
AU  - Lipsey, Richard G.
AU  - Forrest,  David 
AU  - Olsen, Wendy 
TI  - Workbook for the seventh edition of "An introduction to positive economics"
SN  - 0297795589
U1  - 330 LIP 
PY  - 1989///
CY  - London
PB  - Weidenfeld and Nicolson, 
KW  - Economics
N1  - With answers
ER  -