APA (7th ed.) Citation

Eco, U., & Grau Petit, C. Obra abierta.

Chicago Style (17th ed.) Citation

Eco, Umberto, and Carlos Grau Petit. Obra Abierta. Barcelona.

MLA (9th ed.) Citation

Eco, Umberto, and Carlos Grau Petit. Obra Abierta.

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