@article{Massey1993,
author = {Massey, D.S. and Arango, J.  and Hugo, G. and Kouaouci, A. and Pellegrino, A. and Taylor, J.E.},
title= {Theories of international migration: a review and appraisal},
year = {1993},
doi = {10.2307/2938462},
journal = {Population and Development Review},
volume = {19},
pages = {431--466},
}