APA (7th ed.) Citation

Eco, U. (1977). A theory of semiotics / (by) Umberto Eco. Macmillan.

Chicago Style (17th ed.) Citation

Eco, Umberto. A Theory of Semiotics / (by) Umberto Eco. London (etc.): Macmillan, 1977.

MLA (9th ed.) Citation

Eco, Umberto. A Theory of Semiotics / (by) Umberto Eco. Macmillan, 1977.

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