APA

Gower R., . (2006). Grammar in practice 6. Upper-intermediate. Edinburgh: Cambridge University Press.

Chicago

Gower R, . 2006. Grammar in practice 6. Upper-intermediate. Edinburgh: Cambridge University Press.

Harvard

Gower R., . (2006). Grammar in practice 6. Upper-intermediate. Edinburgh: Cambridge University Press.

MLA

Gower R, . Grammar in practice 6. Upper-intermediate. Edinburgh: Cambridge University Press. 2006.