APA

Kerr P., Jones C., . (2007). Straightforward. Upper Intermediate Student`s Book. Oxford: Macmillan.

Chicago

Kerr P, Jones C, . 2007. Straightforward. Upper Intermediate Student`s Book. Oxford: Macmillan.

Harvard

Kerr P., Jones C., . (2007). Straightforward. Upper Intermediate Student`s Book. Oxford: Macmillan.

MLA

Kerr P, Jones C, . Straightforward. Upper Intermediate Student`s Book. Oxford: Macmillan. 2007.