APA (7th ed.) Citation

Stockham, R., & Emshwiller, E. (2010). The Valley. Project Gutenberg.

Chicago Style (17th ed.) Citation

Stockham, Richard, and Ed Emshwiller. The Valley. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Stockham, Richard, and Ed Emshwiller. The Valley. Project Gutenberg, 2010.

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