@book{20080,
	author = {Demana, franklin D., Bert K. Waits, Gregory D. Foley and Daniel Kennedy},
	title = {Precalculus: Graphical, Numerical, Algebraic},
	publisher = {Pearson Education},
	year = {2010},
	address = {Boylston Street, Boston},
	edition = {Florida ed.}
}