APA

Kerr P., Jones C., . (2006). Straightforward. Intermediate. Oxford: Macmillan.

Chicago

Kerr P, Jones C, . 2006. Straightforward. Intermediate. Oxford: Macmillan.

Harvard

Kerr P., Jones C., . (2006). Straightforward. Intermediate. Oxford: Macmillan.

MLA

Kerr P, Jones C, . Straightforward. Intermediate. Oxford: Macmillan. 2006.