APA (7th ed.) Citation

Kenny, N., & Clark, T. (1999). Proficiency insight: Workbook and companion. Macmillan Heinemann.

Chicago Style (17th ed.) Citation

Kenny, Nick, and Tony Clark. Proficiency Insight: Workbook and Companion. Oxford: Macmillan Heinemann, 1999.

MLA (9th ed.) Citation

Kenny, Nick, and Tony Clark. Proficiency Insight: Workbook and Companion. Macmillan Heinemann, 1999.