BARBER, Sadie; SCOTT, Steve. Botanical Envelopes. Sibbaldia: the International Journal of Botanic Garden Horticulture, [S. l.], n. 7, p. 197–200, 2009. DOI: 10.24823/Sibbaldia.2009.168. Disponível em: https://journals.rbge.org.uk/rbgesib/article/view/168. Acesso em: 31 may. 2025.