Gower R. Roger. (2011). Grammar in practice 4: 40 units of self-study grammar exercises with tests (5th ed.). Edinburgh, Cambridge University Press, 2011.
Цитирование в стиле Чикаго (17-е изд.)Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises with Tests. 5th ed. Edinburgh, Cambridge University Press, 2011, 2011.
Цитирование MLA (9-е изд.)Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises with Tests. 5th ed. Edinburgh, Cambridge University Press, 2011, 2011.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.