Stillwell, John. Elements of algebra : Geometry, numbers, equations / J. Stillwell. - New York : Springer-Verlag, 1994. - xi, 181 p. ill. ; 25 cm. - Undergraduate texts in mathematics . Includes bibliographical references (p. [162]-169) and index= ISBN: 0387942904 (New York : acid-free paper) Subjects--Topical Terms: Algebra