APA (7th ed.) Citation

Garrett, R., & Silverberg, R. (2008). The Judas Valley. Project Gutenberg.

Chicago Style (17th ed.) Citation

Garrett, Randall, and Robert Silverberg. The Judas Valley. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Garrett, Randall, and Robert Silverberg. The Judas Valley. Project Gutenberg, 2008.

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