APA

May P., . (2002). Towards proficiency. Student's book. Oxford: Oxford University Press.

Chicago

May P, . 2002. Towards proficiency. Student's book. Oxford: Oxford University Press.

Harvard

May P., . (2002). Towards proficiency. Student's book. Oxford: Oxford University Press.

MLA

May P, . Towards proficiency. Student's book. Oxford: Oxford University Press. 2002.