APA (7th ed.) Citation

Willson, T. E. (2004). Ancient and Modern Physics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Willson, Thomas E. Ancient and Modern Physics. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Willson, Thomas E. Ancient and Modern Physics. Project Gutenberg, 2004.

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