Varberg, Dale E. Calculus with analytic geometry / Dale Varberg, Edwin J. Purcell. - 6th ed. - Englewood Cliffs : Prentice Hall, 1992. - xvi, 921 p. : col. ill. ; 26 cm. ISBN: 0131177559 (hbk. ) Subjects--Topical Terms: Calculus.Geometry, Analytic.