Hewings, Martin. Advanced grammar in use : a self-study reference and practice book for advanced learners of English ; with answers / Martin Hewings. - 2nd ed. - Cambridge : Cambridge University Press, 2005. - ix, 294 p. ; 27 cm. + 1 CD-ROM (4 3/4 in.) ISBN: 0521532914 LCCN: 2005-432966 LC Class. No.: PE1112 / .H47 2005