Cita APA (7a ed.)

Gairns R. Ruth & Redman S. Stuart. (2002). Natural English. Intermediate: Student's book. New York, Oxford University Press, 2002.

Cita Chicago Style (17a ed.)

Gairns R. Ruth y Redman S. Stuart. Natural English. Intermediate: Student's Book. New York, Oxford University Press, 2002, 2002.

Cita MLA (9a ed.)

Gairns R. Ruth y Redman S. Stuart. Natural English. Intermediate: Student's Book. New York, Oxford University Press, 2002, 2002.