Cita APA (7a ed.)

Gower, R. (2005). Grammar in practice 6: 40 units of self-study grammar exercises : with tests. Cambridge University Press.

Cita Chicago Style (17a ed.)

Gower, Roger. Grammar in Practice 6: 40 Units of Self-study Grammar Exercises : With Tests. Cambridge: Cambridge University Press, 2005.

Cita MLA (9a ed.)

Gower, Roger. Grammar in Practice 6: 40 Units of Self-study Grammar Exercises : With Tests. Cambridge University Press, 2005.