APA (7th ed.) Citation

Cook, H. F., Kenyon, H., & Allen, F. E. (1966). Modern German for adults (Revised ed.). Dent.

Chicago Style (17th ed.) Citation

Cook, H. F., H. Kenyon, and Frances E. Allen. Modern German for Adults. Revised ed. London: Dent, 1966.

MLA (9th ed.) Citation

Cook, H. F., et al. Modern German for Adults. Revised ed. Dent, 1966.