ISBN: 0071113029 (international student ed. : pbk.)
ISBN: 0073524166 (hard copy : alk. paper)
ISBN: 007893673X (student ed.)
ISBN: 9780071113021 (international student ed. : pbk.)
ISBN: 9780073524160 (hard copy : alk. paper)
ISBN: 9780078936739 (student ed.)