APA (7th ed.) Citation

Otis, J. (2009). Ralph Gurney's Oil Speculation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Otis, James. Ralph Gurney's Oil Speculation. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Otis, James. Ralph Gurney's Oil Speculation. Project Gutenberg, 2009.

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