Pape, H. Peirce and his followers: Helmut Pape. [Semiotik, 2].(1998).
Chicago-referens (17:e uppl.)Pape, Helmut. "Peirce and His Followers: Helmut Pape." [Semiotik, 2].(1998) .
MLA-referens (8:e uppl.)Pape, Helmut. "Peirce and His Followers: Helmut Pape." [Semiotik, 2].(1998), .
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.