@book{110257,
	author = {Octavio de Toledo y Zulueta, Luis,},
	title = {Tratado de trigonometría rectilínea y esférica / },
	editor = {Imp. Clásica Española)},
	publisher = {[s.n.], },
	year = {1922 (},
	address = {Madrid : },
	edition = {4ª. ed.}
}