Buck, Matthias; Marshall, Stephen A.; Cheung, David K.B. (19 de febrero de 2008). «Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region». Canadian Journal of Arthropod Identification5. ISSN1911-2173. doi:10.3752/cjai.2008.05.
Aalbu, Rolf L.; Kanda, Kojun; Steiner, Warren E., Jr. (April 2009). «Opatroides punctulatus Brullé now established in California (Coleoptera: Tenebrionidae).». The Pan-Pacific Entomologist85 (2): 38-42. doi:10.3956/2008-24.1.
Buck, Matthias; Marshall, Stephen A.; Cheung, David K.B. (19 de febrero de 2008). «Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region». Canadian Journal of Arthropod Identification5. ISSN1911-2173. doi:10.3752/cjai.2008.05.