APA (7th ed.) Citation

Ruppelt, E. J. (2005). The Report on Unidentified Flying Objects. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ruppelt, Edward J. The Report on Unidentified Flying Objects. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Ruppelt, Edward J. The Report on Unidentified Flying Objects. Project Gutenberg, 2005.

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