APA (7th ed.) Citation

Ruth Gairns. Natural English: Intermediate teacher's book ("?".). Oxford University Press.

Chicago Style (17th ed.) Citation

Ruth Gairns. Natural English: Intermediate Teacher's Book. "?". USA: Oxford University Press.

MLA (9th ed.) Citation

Ruth Gairns. Natural English: Intermediate Teacher's Book. "?". Oxford University Press.

Warning: These citations may not always be 100% accurate.