Cely, C.C. and Sarmiento, C.E. 2011. What about intraspecific variation? Reassessment of taxonomic and phylogenetic characters in the genus Synoeca de Saussure (Hymenoptera: Vespidae: Polistinae). Zootaxa. 2899, 1 (May 2011), 43–59. DOI:https://doi.org/10.11646/zootaxa.2899.1.2.