APA (7th ed.) Citation

Ringo, J., & Thomsen, B. (2010). Citizens. Baen.

Chicago Style (17th ed.) Citation

Ringo, John, and Brian Thomsen. Citizens. Riverdale, NY: Baen, 2010.

MLA (9th ed.) Citation

Ringo, John, and Brian Thomsen. Citizens. Baen, 2010.