APA

Sinclair B., Prowse P., . (1997). Activate your English. Cambridge University Press: .

Chicago

Sinclair Barbara, Prowse Philip, . 1997. Activate your English. Cambridge University Press: .

Harvard

Sinclair B., Prowse P., . (1997). Activate your English. Cambridge University Press: .

MLA

Sinclair Barbara, Prowse Philip, . Activate your English. Cambridge University Press: . 1997.