TY  - BOOK
AU  - [and others]
AU  - Mckenzie, David
TI  - How important is selection?
T2  - World Bank policy research working papers
AV  - IBRD(08)PRWP/3906 
PY  - 2006///
CY  - Washington, D. C
PB  - World Bank
KW  - GAIN IN INCOME--RESEARCH--MIGRATION
ER  -