Citazione Stile APA (7a Edizione)

Doyle, A. C. (1975). A study in Scarlet and The sign of four (1a. ed.). Berkley Books.

Citazione stile Chigago Style (17a edizione)

Doyle, Arthur Conan. A Study in Scarlet and The Sign of Four. 1a. ed. Nueva York: Berkley Books, 1975.

Citatione MLA (9a ed.)

Doyle, Arthur Conan. A Study in Scarlet and The Sign of Four. 1a. ed. Berkley Books, 1975.