Somfai, E. 1959. Hangya alkatúak Formicoidea. Magyarország Allatvilága 43:1-79.
Sonan, J. 1940. M. Yanagihara's collection from Daito-Islands, Okinawa: Hymenoptera. Transactions of the Natural History Society of Formosa 30:369-375. PDF

Notes: Formicidae p. 375.

Sonnenburg, H. 2005. Die Ameisenfauna (Hymenoptera: Formicidae) Niedersachsens und Bremens. Braunschweiger Naturkundliche Schriften 7:377-441.
Sonobe, R. 1973. Ant fauna of the Sesoko Island, Okinawa. Sesoko Marine Science Laboratory Technical Report 2:15-16.
Sonobe, R. 1977a. Ant fauna of Miyagi Prefecture, Japan. Japanese Journal of Ecology 27:111-116.
Sorger, D. M.; Zettel, H. 2010. Taxonomic additions to the Polyrhachis (Myrma) cyaniventris species group (Insecta: Hymenoptera: Formicidae). Annalen des Naturhistorischen Museums in Wien. B, Botanik, Zoologie 111:31-36. PDF