Hashemi, Louise. Cambridge grammar for PET with answers : self-study grammar reference and practice / Louise Hashemi and Barbara Thomas. - Cambridge : Cambridge University Press, 2006 - viii, 216 p. : 25 cm. + 2 Audio CDs ISBN: 9780521601214 Subjects--Topical Terms: English language Subjects--Index Terms: Ngôn ngữ Ngữ pháp Tiếng Anh Dewey Class. No.: 428.24076 / HAS