@book{102221,
	author = {Bourguignon, Erika, and Ucko, Lenora Greenbaum.},
	title = {Diversity and homogeneity in world societies /},
	publisher = {HRAF Press,},
	year = {1973.},
	address = {[New Haven, Conn.]},
	note = {Expanded and updated version of the authors' Diversity and homogeneity, issued in 1968.}
}