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).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEco, Umberto, Roberto Lambertini, Costantino Marmo, और Andrea Tabarroni. "On Animal Language in the Medieval Classification of Signs: Umberto Eco. Roberto Lambertini." On the Medieval Theory of Signs.(1989) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रEco, Umberto, et al. "On Animal Language in the Medieval Classification of Signs: Umberto Eco. Roberto Lambertini." On the Medieval Theory of Signs.(1989), .
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