Gower R. Roger. (2008). Grammar in practice 6. Upper-intermediate: 40 units of self-study grammar exercises (3td. ed.). Edinburgh, Cambridge University Press, 2008.
Citace podle Chicago (17th ed.)Gower R. Roger. Grammar in Practice 6. Upper-intermediate: 40 Units of Self-study Grammar Exercises. 3td. ed. Edinburgh, Cambridge University Press, 2008, 2008.
Citace podle MLA (9th ed.)Gower R. Roger. Grammar in Practice 6. Upper-intermediate: 40 Units of Self-study Grammar Exercises. 3td. ed. Edinburgh, Cambridge University Press, 2008, 2008.
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