APA (7th ed.) Citation

Sibbald, F., & Mason, P. (1994). Grammar four: Teacher's book. Oxford University Press.

Chicago Style (17th ed.) Citation

Sibbald, Fiona, and Paul Mason. Grammar Four: Teacher's Book. Oxford: Oxford University Press, 1994.

MLA (9th ed.) Citation

Sibbald, Fiona, and Paul Mason. Grammar Four: Teacher's Book. Oxford University Press, 1994.