APA (7th ed.) Citation

Simak, C. D. (2008). Hellhounds of the Cosmos. Project Gutenberg.

Chicago Style (17th ed.) Citation

Simak, Clifford D. Hellhounds of the Cosmos. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Simak, Clifford D. Hellhounds of the Cosmos. Project Gutenberg, 2008.

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