A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
Cita Chicago (17th ed.)A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
Cita MLA (9th ed.)A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.