APA (7th ed.) Citation

Forbes, W. C. (1919). As to polo (Fourth ed.). [publisher not identified].

Chicago Style (17th ed.) Citation

Forbes, W. Cameron. As to Polo. Fourth ed. [Place of publication not identified]: [publisher not identified], 1919.

MLA (9th ed.) Citation

Forbes, W. Cameron. As to Polo. Fourth ed. [publisher not identified], 1919.