APA (7th ed.) Citation

Paton, A., & Gardner, C. O. (1975). Knocking on the door: Shorter writings. Scribner.

Chicago Style (17th ed.) Citation

Paton, Alan, and Colin Oxenham Gardner. Knocking on the Door: Shorter Writings. New York: Scribner, 1975.

MLA (9th ed.) Citation

Paton, Alan, and Colin Oxenham Gardner. Knocking on the Door: Shorter Writings. Scribner, 1975.