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• 9780521613736 (Student's book with answers). - 0521613736 (Student's book with answers) 1
• 9780521671873 (pbk.) 1
• 9780521675178 1
• 9780521684187 (bk. 3 : pbk.) 1
• 9780521685566 1
• 9780521706650 1
• 9780521734882 1
• 9780521748629 (ed. with answers and CD-ROM : pbk.). - 9780521128285 (ed. with answers : pbk.). - 0521748623 (pbk.) 1
• 9780521831796. - 0521831792 1
• 9780521836067 (hbk.). - 0521836069 (hbk. : alk. paper). - 9780521543934 (pbk.). - 0521543932 (pbk. : alk. paper) 1
• 9780521847681 (hbk.). - 0521847680 (hbk.). - 9780521612357 (pbk.). - 0521612357 (pbk.) 1
• 9780521870818. - 052187081X. - 9780521691321 (pbk.). - 052169132X (pbk.) 1
• 9780521884167 (hbk.). - 9780521711159 (pbk.). - 0521884160 (hbk.). - 0521711150 (pbk.) 1
• 9780521886659 (hardback : alk. paper). - 9780521714143 (pbk. : alk. paper) 1
• 9780582894372. - 0582894379 1
• 9780631228998 (alk. paper). - 9781405138093 (pbk.). - 1405138092 (pbk.) 1
• 9780631231431 (pbk. : alk. paper). - 0631231439 (pbk. : alk. paper). - 9780631231493 (hardcover : alk. paper). - 0631231498 (hardcover : alk. paper) 1
• 9780735213678 (paperback)) 1
• 9780801895531 (hardcover : acid-free paper) 1
• 9780801895548 (pbk. : acid-free paper) 1