APA (7th ed.) Citation

Eco, U. (1989). On the Medieval theory of signs. Jhon Benjamins Publishing Company.

Chicago Style (17th ed.) Citation

Eco, Umberto. On the Medieval Theory of Signs. Jhon Benjamins Publishing Company, 1989.

MLA (8th ed.) Citation

Eco, Umberto. On the Medieval Theory of Signs. Jhon Benjamins Publishing Company, 1989.

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