Cita APA (7th ed.)

ebrary, Inc, Eco, U., & Marmo, C. (1989). On the medieval theory of signs. J. Benjamins.

Cita Chicago (17th ed.)

ebrary, Inc, Umberto Eco, i Costantino Marmo. On the Medieval Theory of Signs. Amsterdam ; Philadelphia: J. Benjamins, 1989.

Cita MLA (9th ed.)

ebrary, Inc, et al. On the Medieval Theory of Signs. J. Benjamins, 1989.