TY  - BOOK
AU  - Psacharopoulos G
AU  -  Hinchiliffe K
TI  - Returns to ecucation:  An international comparison   
SN  - 0444410279
U1  - X:77ogT.1.N7, L3 
PY  - 1973///
CY  - Amsterdam
PB  - Elsevier          
ER  -