Cita APA (7a ed.)

Eco, U., Lambertini, R., Marmo, C., & Tabarroni, A. On animal language in the medieval classification of signs: Umberto Eco. Roberto Lambertini .. On the Medieval theory of signs.(1989).

Cita Chicago Style (17a ed.)

Eco, Umberto, Roberto Lambertini, Costantino Marmo, y Andrea Tabarroni. "On Animal Language in the Medieval Classification of Signs: Umberto Eco. Roberto Lambertini .." On the Medieval Theory of Signs.(1989) .

Cita MLA (8a ed.)

Eco, Umberto, et al. "On Animal Language in the Medieval Classification of Signs: Umberto Eco. Roberto Lambertini .." On the Medieval Theory of Signs.(1989), .