APA (7th ed.) Citation

Doyle, A. C. (2011). The Crime of the Congo. Project Gutenberg.

Chicago Style (17th ed.) Citation

Doyle, Arthur Conan. The Crime of the Congo. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Doyle, Arthur Conan. The Crime of the Congo. Project Gutenberg, 2011.

Warning: These citations may not always be 100% accurate.