Gower, R. (2002). Grammar in practice 1: 40 units of self-study grammar exercises, with tests (1a. ed.). Cambridge University.
Citace podle Chicago (17th ed.)Gower, Roger. Grammar in Practice 1: 40 Units of Self-study Grammar Exercises, with Tests. 1a. ed. Cambridge: Cambridge University, 2002.
Citace podle MLA (9th ed.)Gower, Roger. Grammar in Practice 1: 40 Units of Self-study Grammar Exercises, with Tests. 1a. ed. Cambridge University, 2002.
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