APA

May P., Martin J., . (2008). Knockout. First Certificate. Oxford: Oxford University Press.

Chicago

May P, Martin J, . 2008. Knockout. First Certificate. Oxford: Oxford University Press.

Harvard

May P., Martin J., . (2008). Knockout. First Certificate. Oxford: Oxford University Press.

MLA

May P, Martin J, . Knockout. First Certificate. Oxford: Oxford University Press. 2008.