WALKER, Timothy. Obsession is Good.
Sibbaldia: the International Journal of Botanic Garden Horticulture,
[S. l.], n. 3, p. 3–5, 2005. DOI:
10.24823/Sibbaldia.2005.106. Disponível em:
https://journals.rbge.org.uk/rbgesib/article/view/106. Acesso em: 4 jul. 2025.