@book{Massey1998,
author = {Massey, D.S. and Arango, J. and Hugo, G. and Kouaouci, A. and Pellegrino, A. and Taylor, J.E.},
title= {Worlds in motion: Understanding international migration at the end of the millennium},
year = {1998},
address = {Oxford},
publisher = {Clarendon Press},
}