@book{131515,
	author = {Educational Testing Service.},
	title = {The official guide to the GRE revised general test /},
	edition = {2nd edition.},
	note = {"For all test dates on or after August 1, 2011"--Cover.},
	url = {http://www.loc.gov/catdir/enhancements/fy1206/2012931062-b.html}
}