1. Baltazar, C., 1966. A catalogue of Philippine Hymenoptera. Pacific Insects Monograph. 8, 1–488.
2. A study of certain types of diplopterous wasps in the collection of the British Museum;Bequaert;Ann. Mag. Nat. History,1928
3. A catalogue of the Eumeninae (Hymenoptera: Vespidae) of the Ethiopian region excluding Malagasy subregion. Part II: genera Delta de Saussure 1885 to Zethus Fabricius 1804 and species incertae sedis;Carpenter;Linzer Biol. Beiträge,1885
4. Dalla Torre, K.W.V., 1894. Catalogus Hymenopterorum, 9, Vespidae (Diploptera). Leipzig. 181 pp.
5. Hymenoptera family vespidae;Dalla Torre;Genera Insectorum.,1904