@book{368,
	author = {Kells, Lyman M., Willis F. Kern, James R. Bland, Lyman M. Kells, Willis F. Kern, James R. Blan},
	title = {Plane and spherical trigonometry},
	publisher = { McGraw-Hill Book Company , Inc.},
	year = {1978},
	edition = {3rd Edition}
}