@book{12775,
	author = {Sparks, Fred W. and Rees, Paul Klein.},
	title = {Plane trigonometry /},
	publisher = {Prentice Hall College Div,},
	year = {1984.},
	address = {[S.l.] :},
	edition = {8 Sub ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0136792251/chopaconline-20}
}