Cheek, Martin, and Matthew Jebb. “Recircumscription of the Nepenthes Alata Group (Caryophyllales: Nepenthaceae), in the Philippines, With Four New Species”. European Journal of Taxonomy0, no. 69 (December 12, 2013). Accessed November 27, 2024. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/191.