APA (7th ed.) Citation

Rogers, H. R. (2008). New and Original Theories of the Great Physical Forces. Project Gutenberg.

Chicago Style (17th ed.) Citation

Rogers, Henry Raymond. New and Original Theories of the Great Physical Forces. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Rogers, Henry Raymond. New and Original Theories of the Great Physical Forces. Project Gutenberg, 2008.

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