APA (7th ed.) Citation

Oppenheim, E. P. (2005). The Black Box. Project Gutenberg.

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips. The Black Box. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Oppenheim, E. Phillips. The Black Box. Project Gutenberg, 2005.

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