Liljeblad, J.; Ronquist, F.; Nieves-Aldrey, J.-L.; Fontal-Cazalla, F.; Ros-Farre, P.; Gaitros, D.; Pujade-Villar, J. A Fully Web-Illustrated Morphological Phylogenetic Study of Relationships Among Oak Gall Wasps and Their Closest Relatives (Hymenoptera: Cynipidae). Zootaxa 2008, 1796, 1–73.