LOEDOLFF, P. OPVOEDKUNDIGE TEGNOLOGIE: DIE OORPSRONG EN ONTWIKKELING VAN DIE ONDERRIGFILM. Scientia Militaria - South African Journal of Military Studies, [S. l.], v. 10, n. 1, 2012. DOI: 10.5787/10-1-719. Disponível em: https://www.journals.ac.za/index.php/pub/article/view/719. Acesso em: 12 jun. 2026.