Junior, J.N.A.D.S., Silveira, O.T. & Carpenter, J.M. (2015)

Phylogeny of Protopolybia Ducke, 1905 and taxonomic revision of the Protopolybia exigua species-group (Hymenoptera: Vespidae, Polistinae), with description of four new species

. Zootaxa, 3956 (2), 151–182.