Acarnley, P. P. Stepping motors : a guide to modern theory and practice / by P.P. Acarnley. - 3rd rev. ed. - London : Peter Peregrinus, 1992. - viii, 162 pages : illustrations. - IEE Control Engineering Series; 19 . Includes bibliographical references and index. ISBN: 0863410278 : $ Subjects--Topical Terms: Stepping motors.