Hong, Y. and James, S.W. 2008. Three new earthworms of the genus Pheretima (Oligochaeta: Megascolecidae) from Mt. Makiling, Luzon Island, Philippines. Zootaxa. 1695, 1 (Feb. 2008), 45–52. DOI:https://doi.org/10.11646/zootaxa.1695.1.2.