APA (7th ed.) Citation

Grossmith, G., & Grossmith, W. (2007). The Diary of a Nobody. Project Gutenberg.

Chicago Style (17th ed.) Citation

Grossmith, George, and Weedon Grossmith. The Diary of a Nobody. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Grossmith, George, and Weedon Grossmith. The Diary of a Nobody. Project Gutenberg, 2007.

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