Headway : upper intermediate. Student’s book / / Liz & John Soars, Paul Hancock . Oxford :  Oxford University Press , 2023 . 168 s . ISBN 978-0-19-453969-2 . [1, of that borrowed 0]

Think first certificate ; Self-study guide / Richard Acklam . Harlow :  Longman group UK Ltd. , 1992 . 110 s . ISBN 0-582-55984-7 . [1, of that borrowed 0]