Gosik, R. and Sprick, P. (2012) “Morphology and identification of the pupae of seven species of the genus Otiorhynchus Germar, 1822 (Coleoptera, Curculionidae, Otiorhynchini)”, Zootaxa. Auckland, New Zealand, 3483(1), pp. 39–57. doi: 10.11646/zootaxa.3483.1.3.