APA (7th ed.) Citation

Fitch, G. W., & Fitch, W. T. (2012). Language evolution: Critical concepts in linguistics. Routledge.

Chicago Style (17th ed.) Citation

Fitch, Gesche Westphal, and W. Tecumseh Fitch. Language Evolution: Critical Concepts in Linguistics. Milton Park, Abingdon, Oxon: Routledge, 2012.

MLA (9th ed.) Citation

Fitch, Gesche Westphal, and W. Tecumseh Fitch. Language Evolution: Critical Concepts in Linguistics. Routledge, 2012.