A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
Lua i Stíl Chicago (17ú heag.)A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
Lua MLA (9ú heag.)A. C. Doyle. The Sign of the Four. Москва, T8RUGRAM, 2017.
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