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Clarke et al. (2000). Nepenthes bellii. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Listed as Endangered (EN B1+2e v2.3)
Kondo, K. 1969. A new species of Nepenthes from the Philippines. Bulletin of the Torrey Botanical Club 96 (6) : 653–655.
