TY  - BOOK
AU  - Ruffin, Roy J.
TI  - Principles of Economics
SN  - 0673460207 (paperback) | 9780673460202 (paperback)
U1  - 330 RUF-P 
PY  - 1989///
CY  - [S.l.]
PB  - Longman
ER  -