Young, L. M.; Marris, J. W. M.; Pawson, S. M. (2008). "Back from extinction: Rediscovery of the Canterbury knobbled weevil Hadramphus tuberculatus(Pascoe 1877) (Coleoptera: Curculionidae), with a review of its historical distribution". New Zealand Journal of Zoology. 35 (4): 323. doi:10.1080/03014220809510129. S2CID84458564.
Young, L. M.; Marris, J. W. M.; Pawson, S. M. (2008). "Back from extinction: Rediscovery of the Canterbury knobbled weevil Hadramphus tuberculatus(Pascoe 1877) (Coleoptera: Curculionidae), with a review of its historical distribution". New Zealand Journal of Zoology. 35 (4): 323. doi:10.1080/03014220809510129. S2CID84458564.