@book{13612,
	author = {Ayres, Frank and Moyer, Robert, autor.},
	title = {Trigonometría. /},
	publisher = {McGraw-Hill,},
	year = {1991},
	series = {Schaum},
	address = {México, D. F.:},
	edition = {Segunda edición},
	note = {Incluye índice.}
}