@book{47677,
	author = {Niles, Nathan O. and España Valenzuela,  Romeo,},
	title = {Trigonometría plana },
	publisher = {Editorial Limusa,},
	year = {1970.},
	address = {México :},
	edition = {2a ed.},
	note = {Incluye apéndice e índice.}
}