Cita APA (7th ed.)

Doyle, A. C., & Edwards, O. D. (1994). The valley of fear. Oxford University Press.

Cita Chicago (17th ed.)

Doyle, Arthur Conan, i Owen Dudley Edwards. The Valley of Fear. Oxford [England] ; New York: Oxford University Press, 1994.

Cita MLA (9th ed.)

Doyle, Arthur Conan, i Owen Dudley Edwards. The Valley of Fear. Oxford University Press, 1994.