Tung, N. T. (2012) “Descriptions of two new species of earthworm of the genus Pheretima Kinberg, 1867 (Oligochaeta: Megascolecidae) from Mekong delta - Vietnam”, Academia Journal of Biology, 33(1), pp. 24–29. doi: 10.15625/0866-7160/v33n1.730.