APA

Gairns R., Redman S., . (2006). Natural English. Elementary. New York: Oxford University Press.

Chicago

Gairns R, Redman S, . 2006. Natural English. Elementary. New York: Oxford University Press.

Harvard

Gairns R., Redman S., . (2006). Natural English. Elementary. New York: Oxford University Press.

MLA

Gairns R, Redman S, . Natural English. Elementary. New York: Oxford University Press. 2006.