APA (7th ed.) Citation

Tolstoy, L., Maude, L., & Maude, A. (2008). The Power of Darkness. Project Gutenberg.

Chicago Style (17th ed.) Citation

Tolstoy, Leo, Louise Maude, and Aylmer Maude. The Power of Darkness. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Tolstoy, Leo, et al. The Power of Darkness. Project Gutenberg, 2008.

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