APA (7th ed.) Citation

Mercer, N., Swann, J., & Mayor, B. (2007). Learning English. Routledge.

Chicago Style (17th ed.) Citation

Mercer, Neil, Joan Swann, and Barbara Mayor. Learning English. Abingdon: Routledge, 2007.

MLA (9th ed.) Citation

Mercer, Neil, et al. Learning English. Routledge, 2007.