KIRSTEIN, C.F. Ontswaeling: Waar staan ons vandag in Suid-Afrika?. Clean Air Journal, [S. l.], v. 3, n. 1, 1976. DOI: 10.17159/caj/1976/3/1.7237. Disponível em: https://cleanairjournal.org.za/article/view/7237. Acesso em: 18 may. 2024.