APA (7th ed.) Citation

Adams, B. (2014). The Law of Civilization and Decay An Essay on History. Project Gutenberg.

Chicago Style (17th ed.) Citation

Adams, Brooks. The Law of Civilization and Decay An Essay on History. Project Gutenberg, 2014.

MLA (9th ed.) Citation

Adams, Brooks. The Law of Civilization and Decay An Essay on History. Project Gutenberg, 2014.

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