APA (7th ed.) Citation

Hooper, W. G. (2008). Aether and Gravitation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hooper, William George. Aether and Gravitation. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Hooper, William George. Aether and Gravitation. Project Gutenberg, 2008.

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