Petrilli, S., & Ponzio, A. Peirce and medieval semiotics: Susan Petrilli. Augusto Ponzio. Peirce's doctrine of signs : theory, applications, and connections.(1996).
Chicago-referens (17:e uppl.)Petrilli, Susan, och Augusto Ponzio. "Peirce and Medieval Semiotics: Susan Petrilli. Augusto Ponzio." Peirce's Doctrine of Signs : Theory, Applications, and Connections.(1996) .
MLA-referens (8:e uppl.)Petrilli, Susan, och Augusto Ponzio. "Peirce and Medieval Semiotics: Susan Petrilli. Augusto Ponzio." Peirce's Doctrine of Signs : Theory, Applications, and Connections.(1996), .
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.