Citazione Stile APA (7a Edizione)

Gower R. Roger. (2005). Grammar in practice 4: 40 units of self-study grammar exercises. Edinburgh, Cambridge University Press, 2005.

Citazione stile Chigago Style (17a edizione)

Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises. Edinburgh, Cambridge University Press, 2005, 2005.

Citatione MLA (9a ed.)

Gower R. Roger. Grammar in Practice 4: 40 Units of Self-study Grammar Exercises. Edinburgh, Cambridge University Press, 2005, 2005.