APA (7th ed.) Citation

Doyle, A. C. (1960). The sign of four (New era ed.). Sir Isaac Pitman & Sons.

Chicago Style (17th ed.) Citation

Doyle, Arthur Conan. The Sign of Four. New era ed. London: Sir Isaac Pitman & Sons, 1960.

MLA (8th ed.) Citation

Doyle, Arthur Conan. The Sign of Four. New era ed. Sir Isaac Pitman & Sons, 1960.