TY  - BOOK
AU  - Lewis G J
TI  - Human migration :  A geographical perspective   
T2  - Croom Helm Series in Geography and Environment
U1  - U42, M2 
PY  - 1980///
CY  - London
PB  - Croom Helm         
KW  - Migration
N1  - Bibliography: P 192-216
ER  -