Selis, Marco. “Notes on the Genus Epsilon De Saussure, 1855 (Hymenoptera: Vespidae: Eumeninae) With Description of a New Species”. Zootaxa 4358, no. 1 (November 28, 2017): 197–200. Accessed May 10, 2025. https://www.mapress.com/zt/article/view/zootaxa.4358.1.12.