@book{6657,
	author = {Simmons, Alan B. and Diaz-Briquets, Sergio, and Migration Review Task Force.},
	title = {Social change and internal migration :},
	publisher = {International Development Research Centre,},
	year = {c1977},
	address = {Ottawa :},
	note = {"A report of the Migration Review Task Force of the International Development Research Centre"}
}