APA (7th ed.) Citation

Silverberg, R. (2008). The Hunted Heroes. Project Gutenberg.

Chicago Style (17th ed.) Citation

Silverberg, Robert. The Hunted Heroes. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Silverberg, Robert. The Hunted Heroes. Project Gutenberg, 2008.

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