APA (7th ed.) Citation

Paton, A., & Gardner, C. O. (1975). Knocking on the door. D. Philip ; obtainable from C. Scribner.

Chicago Style (17th ed.) Citation

Paton, Alan, and Colin Oxenham Gardner. Knocking on the Door. Cape Town : New York: D. Philip ; obtainable from C. Scribner, 1975.

MLA (8th ed.) Citation

Paton, Alan, and Colin Oxenham Gardner. Knocking on the Door. D. Philip ; obtainable from C. Scribner, 1975.