@book{Massey1999,
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 = {1999},
address = {Oxford},
publisher = {Clarendon Press},
}