Gravely, F. H. “On the Occurrence of a Symmetrical Species of Episphenus (Passalid Coleoptera) in Annam”. Records of the Zoological Survey of India 16, no. 4 (May 31, 1919): 297–298. Accessed July 1, 2024. https://recordsofzsi.com/index.php/zsoi/article/view/162799.