APA

Swan M., Walter C., . (1991). The Cambridge English Course. New York: Cambridge University Press.

Chicago

Swan Michael, Walter Catherine, . 1991. The Cambridge English Course. New York: Cambridge University Press.

Harvard

Swan M., Walter C., . (1991). The Cambridge English Course. New York: Cambridge University Press.

MLA

Swan Michael, Walter Catherine, . The Cambridge English Course. New York: Cambridge University Press. 1991.