@book{49144,
	author = {Adler, Philip J.  and Pouwels, Randall Lee,},
	title = {World civilizations /},
	publisher = {Wadsworth/Cengage Learning,},
	year = {[2012]},
	address = {Boston, MA [Estados Unidos] :},
	edition = {Sixth edition, },
	note = {Incluye índice.}
}