@book{81,
	author = {Bentley, Jerry H., and Ziegler, Herbert F.},
	title = {Traditions & encounters : a global perspective on the past vol I: from the beginning to 1500 / },
	publisher = {McGraw-Hill, },
	year = {©2006.},
	address = {Boston: },
	edition = { 3rd ed.},
	note = {Includes index}
}