APA (7th ed.) Citation

Long, F. B. (2008). The Sky Trap. Project Gutenberg.

Chicago Style (17th ed.) Citation

Long, Frank Belknap. The Sky Trap. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Long, Frank Belknap. The Sky Trap. Project Gutenberg, 2008.

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