SPONHOLTZ, Lloyd L. The Initiative and Referendum: Direct democracy in perspective, 1898-1920. American Studies, [S. l.], v. 14, n. 2, p. 43–64, 1973. DOI: 10.1353/amsj.v14i2.2376. Disponível em: https://journals.ku.edu/amsj/article/view/2376.. Acesso em: 1 may. 2024.