APA (7th ed.) Citation

Oppenheim, E. P. (2006). A Maker of History. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips. A Maker of History. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Oppenheim, E. Phillips. A Maker of History. Project Gutenberg, 2006.

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