NAPIER, Clive; LABUSCHAGNE, Pieter. Parliamentary whips in the modern era: a parliamentary necessity or a historical relic?. Southern Journal for Contemporary History, [S. l.], v. 39, n. 1, p. 38–54, 2014. DOI: 10.38140/sjch.v39i1.274. Disponível em: https://journals.ufs.ac.za/index.php/jch/article/view/274. Acesso em: 11 feb. 2026.