APA (7th ed.) Citation

Oppenheim, E. P. (1999). A Millionaire of Yesterday. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips. A Millionaire of Yesterday. Project Gutenberg, 1999.

MLA (9th ed.) Citation

Oppenheim, E. Phillips. A Millionaire of Yesterday. Project Gutenberg, 1999.

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