@book{127600,
	author = {Penna, Judith A. and Bittinger, Marvin L.},
	title = {Graphing calculator manual :},
	publisher = {Addison-Wesley,},
	year = {1997.},
	address = {Reading, Massachuchusetts :},
	note = {Manual to accompany with: College algebra and algebra and trigonometry }
}