APA (7th ed.) Citation

O'Grady William, Archibald John, & Katamba Francis. (2011). Contemporary linguistic: An introduction (2nd ed.). Pearson education ltd..

Chicago Style (17th ed.) Citation

O'Grady William, Archibald John, and Katamba Francis. Contemporary Linguistic: An Introduction. 2nd ed. Harlow: Pearson education ltd., 2011.

MLA (9th ed.) Citation

O'Grady William, et al. Contemporary Linguistic: An Introduction. 2nd ed. Pearson education ltd., 2011.