APA (7th ed.) Citation

Budrys, A., & Emshwiller, E. (2010). The Barbarians. Project Gutenberg.

Chicago Style (17th ed.) Citation

Budrys, Algis, and Ed Emshwiller. The Barbarians. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Budrys, Algis, and Ed Emshwiller. The Barbarians. Project Gutenberg, 2010.

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