Caldara, R. “A Taxonomic Revision of the Weevil Genus Picia Tournier, 1895 (Coleoptera: Curculionoidea: Erirhinidae)”. Zootaxa, vol. 1959, no. 1, Dec. 2008, pp. 39–57, doi:10.11646/zootaxa.1959.1.2.