Buck, Matthias; Marshall, Stephen A.; Cheung, David K.B. (19 February 2008). "Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region". Canadian Journal of Arthropod Identification. 5. doi:10.3752/cjai.2008.05. ISSN1911-2173.
Aalbu, Rolf L.; Kanda, Kojun; Steiner, Warren E. Jr. (April 2009). "Opatroides punctulatus Brullé now established in California (Coleoptera: Tenebrionidae)". The Pan-Pacific Entomologist. 85 (2): 38–42. doi:10.3956/2008-24.1. S2CID84913700.
Aalbu, Rolf L.; Kanda, Kojun; Steiner, Warren E. Jr. (April 2009). "Opatroides punctulatus Brullé now established in California (Coleoptera: Tenebrionidae)". The Pan-Pacific Entomologist. 85 (2): 38–42. doi:10.3956/2008-24.1. S2CID84913700.
Buck, Matthias; Marshall, Stephen A.; Cheung, David K.B. (19 February 2008). "Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region". Canadian Journal of Arthropod Identification. 5. doi:10.3752/cjai.2008.05. ISSN1911-2173.