From obscurity to official opposition : the Progressive Federal Party, 1959-1977. Historia, [S. l.], v. 39, n. 1, 2021. DOI: 10.17159/hasa.v39i1.1578. Disponível em: https://upjournals.up.ac.za/index.php/historia/article/view/1578. Acesso em: 17 aug. 2026.