@book{19296,
	author = {Kells, Lyman M. , Kern, Willis F. & Bland, James R.},
	title = {Plane and Spherical Trigonometry},
	publisher = {McGraw Hill Book Company, Inc.},
	year = {1951},
	address = {New York},
	edition = {Third Edition},
	note = {include appendix}
}