APA (7th ed.) Citation

Allen, W. S. (1964). Living English structure: Key to the exercises. Longmans.

Chicago Style (17th ed.) Citation

Allen, William Stannard. Living English Structure: Key to the Exercises. London: Longmans, 1964.

MLA (9th ed.) Citation

Allen, William Stannard. Living English Structure: Key to the Exercises. Longmans, 1964.