APA (7th ed.) Citation

American Council on the Teaching of Foreign Languages & Byrnes, H. (1986). Defining and developing proficiency: Guidelines, implementations and concepts. National Textbook Co..

Chicago Style (17th ed.) Citation

American Council on the Teaching of Foreign Languages and Heidi Byrnes. Defining and Developing Proficiency: Guidelines, Implementations and Concepts. Lincolnwood, Ill.: National Textbook Co., 1986.

MLA (9th ed.) Citation

American Council on the Teaching of Foreign Languages and Heidi Byrnes. Defining and Developing Proficiency: Guidelines, Implementations and Concepts. National Textbook Co., 1986.