Gaya APA

Eco, U, &, M, C, , (. (1989). On the medieval theory of signs. Foundations of Semiotics, 21 . Amsterdam dsl: Amsterdam dsl John Benjamin Publ Co.

Gaya MLA

Eco, Umberto, &, Marmo,, Costantino, , (ed.). "On the medieval theory of signs. Foundations of Semiotics, 21". Amsterdam dsl: Amsterdam dsl John Benjamin Publ Co, 1989. Buku.