APA (7th ed.) Citation

Dell, E. M. (2004). The Knave of Diamonds. Project Gutenberg.

Chicago Style (17th ed.) Citation

Dell, Ethel M. The Knave of Diamonds. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Dell, Ethel M. The Knave of Diamonds. Project Gutenberg, 2004.

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