Cita APA (7a ed.)

Doyle, A. C., & Roden, C. (1994). The sign of the four. Oxford University Press.

Cita Chicago Style (17a ed.)

Doyle, Arthur Conan, y Christopher Roden. The Sign of the Four. Oxford [England] ; New York: Oxford University Press, 1994.

Cita MLA (8a ed.)

Doyle, Arthur Conan, y Christopher Roden. The Sign of the Four. Oxford University Press, 1994.