WOOLLEY, Dale E. Peirce’s Concept of the Index: The Need for a Fourth Sign. Kansas Working Papers in Linguistics, [S. l.], v. 10, p. 76–88, 1985. DOI: 10.17161/KWPL.1808.498. Disponível em: https://journals.ku.edu/kwpl/article/view/17894. Acesso em: 10 apr. 2025.