Nicholls, J. A., N. E. Furlan, and G. Melika. “Holocynips illinoiensis, Sp. Nov., a New Species of Oak Gall Wasp (Hymenoptera: Cynipidae) from the USA”. Zootaxa, vol. 5301, no. 4, June 2023, pp. 469-85, doi:10.11646/zootaxa.5301.4.5.