Martinsson, Svante. “A Morphology-Based Identification Key to the Cognettia Species of the World (Clitellata: Enchytraeidae)”. SOIL ORGANISMS 91, no. 2 (August 1, 2019): 37–43. Accessed May 21, 2024. https://soil-organisms.org/index.php/SO/article/view/45.