APA (7th ed.) Citation

Eco, U., & Fentress, J. (1997). The search for the perfect language. Fontana Press.

Chicago Style (17th ed.) Citation

Eco, Umberto, and James Fentress. The Search for the Perfect Language. Hammersmith, London: Fontana Press, 1997.

MLA (9th ed.) Citation

Eco, Umberto, and James Fentress. The Search for the Perfect Language. Fontana Press, 1997.

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