APA (7th ed.) Citation

Doyle, A. C. (2005). Through the Magic Door. Project Gutenberg.

Chicago Style (17th ed.) Citation

Doyle, Arthur Conan. Through the Magic Door. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Doyle, Arthur Conan. Through the Magic Door. Project Gutenberg, 2005.

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