FERREIRA, O. Preste João (Priester Jan) en die Portugese omseiling van die suidpunt van Afrika. South African Journal of Cultural History, [S. l.], v. 21, n. 2, p. 105–138, 2009. DOI: 10.4314/sajch.v21i2.6356. Disponível em: https://www.ajol.info/index.php/sajch/article/view/6356. Acesso em: 12 oct. 2026.