APA (7th ed.) Citation

Oppenheim, E. P. (1990). The Zeppelin's passenger. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, Edward Phillips. The Zeppelin's Passenger. Champaign, Ill: Project Gutenberg, 1990.

MLA (9th ed.) Citation

Oppenheim, Edward Phillips. The Zeppelin's Passenger. Project Gutenberg, 1990.

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