@article{Massey1987,
author = {Massey, D.S. and España, F.G.},
title= {The social process of international migration},
year = {1987},
doi = {10.1126/science.237.4816.733},
URL = {https://doi.org/doi:10.1126/science.237.4816.733},
volume = {237},
number = {4816},
pages = {733‒738},
}