L.  Borowiec, ?Catalogue of ants of Europe, the Mediterranean Basin and adjacent regions (Hymenoptera: Formicidae)?, Genus - Monograph, vol. 25, no. 1-2, pp. 1-340, 2014.

A.  Lapeva-Gjonova, Antonova, V., Radchenko, A. G., and Atanasova, M., ?Catalogue of the ants (Hymenoptera, Formicidae) of Bulgaria?, ZooKeys, vol. 62, p. 124, 2010.