APA (7th ed.) Citation

O'Grady, W. D., Dobrovolsky, M., & Katamba, F. (1997). Contemporary linguistics: An introduction. Longman.

Chicago Style (17th ed.) Citation

O'Grady, William D., Michael Dobrovolsky, and Francis Katamba. Contemporary Linguistics: An Introduction. London, New York: Longman, 1997.

MLA (9th ed.) Citation

O'Grady, William D., et al. Contemporary Linguistics: An Introduction. Longman, 1997.