B. T. Dien, N. T. Manh, M. V. Thai, V. T. Thuong, and N. T. P. Lien, “Taxonomic notes on the genus <i>Ectopioglossa</i> Perkins, 1912 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with new records of two species and key to species”, AJB, vol. 43, no. 4, pp. 67–73, Dec. 2021.