APA (7th ed.) Citation

Doyle, A. C., & Greene, H. (1980). A study in scarlet (Published in pbk., 4th printing.). Pan.

Chicago Style (17th ed.) Citation

Doyle, Arthur Conan, and Hugh Greene. A Study in Scarlet. Published in pbk., 4th printing. London [etc.]: Pan, 1980.

MLA (9th ed.) Citation

Doyle, Arthur Conan, and Hugh Greene. A Study in Scarlet. Published in pbk., 4th printing. Pan, 1980.