APA (7th ed.) Citation

Baker, J., & Westrup. (2006). Essentials speaking skills: A handbook for english language teacher. Continuum.

Chicago Style (17th ed.) Citation

Baker, Joanna, and Westrup. Essentials Speaking Skills: A Handbook for English Language Teacher. London: Continuum, 2006.

MLA (8th ed.) Citation

Baker, Joanna, and Westrup. Essentials Speaking Skills: A Handbook for English Language Teacher. Continuum, 2006.