APA (7th ed.) Citation

Oppenheim, E. P. (2005). The Betrayal. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips. The Betrayal. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Oppenheim, E. Phillips. The Betrayal. Project Gutenberg, 2005.

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