APA-viite (7. p.)

Gower, R. (2002). Grammar in practice 1: 40 units of self-study grammar exercises, with tests (1a. ed.). Cambridge University.

Chicago-viite (17. p.)

Gower, Roger. Grammar in Practice 1: 40 Units of Self-study Grammar Exercises, with Tests. 1a. ed. Cambridge: Cambridge University, 2002.

MLA-viite (9. p.)

Gower, Roger. Grammar in Practice 1: 40 Units of Self-study Grammar Exercises, with Tests. 1a. ed. Cambridge University, 2002.