APA (7th ed.) Citation

O'Grady William, Dobrovolsky Michael, & Katamba Francis. (1997). Contemporary linguistic: An introduction. Pearson education ltd..

Chicago Style (17th ed.) Citation

O'Grady William, Dobrovolsky Michael, and Katamba Francis. Contemporary Linguistic: An Introduction. Harlow: Pearson education ltd., 1997.

MLA (9th ed.) Citation

O'Grady William, et al. Contemporary Linguistic: An Introduction. Pearson education ltd., 1997.