APA (7th ed.) Citation

Searle, A. B. (2013). The Natural History of Clay. Project Gutenberg.

Chicago Style (17th ed.) Citation

Searle, Alfred B. The Natural History of Clay. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Searle, Alfred B. The Natural History of Clay. Project Gutenberg, 2013.

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