Elaine Walker. (1998). Grammar practice for upper intermediate students. Harlow, Eng: Pearson.
शिकागो स्टाइल उद्धरणElaine Walker. Grammar Practice for Upper Intermediate Students. Harlow, Eng: Pearson, 1998.
एमएलए उद्धरणElaine Walker. Grammar Practice for Upper Intermediate Students. Harlow, Eng: Pearson, 1998.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.