TY  - BOOK
AU  - McConnell ,Campbell R.
AU  - Brue ,Stanley L.
TI  - Economics : : principles, problems, and policies 
SN  - 0070449678
U1  - 330 
PY  - 1990///
CY  - New York
PB  - McGraw-Hill Publishing Company
KW  - Economics
ER  -