Cita APA (7th ed.)

Gower R. Roger. (2009). Grammar in practice 4: 40 units of self-study grammar exercises (4th ed.). Edinburgh, Cambridge University Press, 2009.

Cita Chicago (17th ed.)

Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises. 4th ed. Edinburgh, Cambridge University Press, 2009, 2009.

Cita MLA (9th ed.)

Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises. 4th ed. Edinburgh, Cambridge University Press, 2009, 2009.