@article{Portes1989,
author = {Portes, A. and Böröcz, J.},
title= {Contemporary Immigration: Theorical Perspectives on Its Determinants and Models of Incorporation},
year = {1989},
journal = {International Migration Review, Special Silver Anniversary Issue: International Migration an Assessment for the 90's (Autumn)},
volume = {23},
number = {3},
pages = {606--630},
}