@book{19295,
	author = {Kells, Lyman M. , Kern, Willis, F & Bland, James R.},
	title = {Plane and Spherical Trigonometry },
	publisher = {McGraw Hill Book Company, Inc.},
	year = {1978},
	address = {New York},
	edition = {Third Edition},
	note = {includes appendix & index}
}