APA (7th ed.) Citation

Gibbs, G. (2008). The Secret Witness. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gibbs, George. The Secret Witness. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Gibbs, George. The Secret Witness. Project Gutenberg, 2008.

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