APA (7th ed.) Citation

Del Rey, L. (2006). Police Your Planet. Project Gutenberg.

Chicago Style (17th ed.) Citation

Del Rey, Lester. Police Your Planet. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Del Rey, Lester. Police Your Planet. Project Gutenberg, 2006.

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