URSEM, Bob. Ex Situ Horticulture of Welwitschia mirabilis. Sibbaldia: the International Journal of Botanic Garden Horticulture, [S. l.], n. 2, p. 47–50, 2004. DOI: 10.24823/Sibbaldia.2004.158. Disponível em: https://journals.rbge.org.uk/rbgesib/article/view/158. Acesso em: 7 apr. 2025.