APA (7th ed.) Citation

Webster, J., & Varian, G. (2007). The Four-Pools Mystery. Project Gutenberg.

Chicago Style (17th ed.) Citation

Webster, Jean, and George Varian. The Four-Pools Mystery. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Webster, Jean, and George Varian. The Four-Pools Mystery. Project Gutenberg, 2007.

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