LEIJEAAR, C. Siekgebou-indroom - ’n krietiese oorsig. Clean Air Journal, [S. l.], v. 8, n. 3, 1991. DOI: 10.17159/caj/1991/8/3.7302. Disponível em: https://cleanairjournal.org.za/article/view/7302. Acesso em: 4 may. 2024.