APA (7th ed.) Citation

Coppel, A., & Martin, B. (2010). The Peacemaker. Project Gutenberg.

Chicago Style (17th ed.) Citation

Coppel, Alfred, and Bob Martin. The Peacemaker. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Coppel, Alfred, and Bob Martin. The Peacemaker. Project Gutenberg, 2010.

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