APA (7th ed.) Citation

Ladefoged, P., & Johnstone, K. (2011). A course in phonetics (6th ed.). Wadsworth/Cengage Learning.

Chicago Style (17th ed.) Citation

Ladefoged, Peter, and Keith Johnstone. A Course in Phonetics. 6th ed. Boston, Mass: Wadsworth/Cengage Learning, 2011.

MLA (9th ed.) Citation

Ladefoged, Peter, and Keith Johnstone. A Course in Phonetics. 6th ed. Wadsworth/Cengage Learning, 2011.