@book{144532,
	author = {Carlsen, G. Robert, and Carlsen, Ruth Christoffer,},
	title = {Perception: },
	publisher = {Webster Division, McGraw-Hill,},
	year = {1975.},
	series = {Themes and writers series},
	address = {New York :},
	edition = {2d ed.},
	note = {Includes index.}
}