@book{50937,
	author = {Sparks, Fred W. and Rees, Paul K.},
	title = {Plane trigonometry /},
	publisher = {Appleton-Century-Crofts,},
	year = {1959, [3rd Printing 1953]},
	address = {New York :},
	edition = {3d ed.},
	note = {index}
}