APA

Gairns R., Redman S., . (2002). Natural English. Intermediate. New York: Oxford University Press.

Chicago

Gairns R, Redman S, . 2002. Natural English. Intermediate. New York: Oxford University Press.

Harvard

Gairns R., Redman S., . (2002). Natural English. Intermediate. New York: Oxford University Press.

MLA

Gairns R, Redman S, . Natural English. Intermediate. New York: Oxford University Press. 2002.