APA

Mcgavigan P., May P. & Guintana J. (2002). Towards proficiency. New York: Oxford University Press.

Chicago

Mcgavigan P, May P and Guintana J. 2002. Towards proficiency. New York: Oxford University Press.

Harvard

Mcgavigan P., May P. and Guintana J. (2002). Towards proficiency. New York: Oxford University Press.

MLA

Mcgavigan P, May P and Guintana J. Towards proficiency. New York: Oxford University Press. 2002.