World class : Level 1 : Students' book / Michael Harris, David Mower. - Harlow : Longman, 1994 (Mateu Cromo). - 106 p. : ill. ; 26 cm.см.. - დაიბეჭდა ესპანეთში. - ISBN 0-582-21859-4[MFN: 45222]
World class : Level 1 : Activity book / Michael Harris, David Mower. - Harlow : Longman, 1994. - 62 p. : ill. ; 27 cm.см.. - ISBN 0-582-21855-1[MFN: 45224]