Gregg, R. E. 1969a. Geographic distribution of the ant genus Formica (Hymenoptera: Formicidae). Proceedings of the Entomological Society of Washington 71:38-49. PDF
Galkowski, C.; Lebas, C.; Cagniant, H. 2024. Redescription de Formica pyrenaea Bondroit, 1948 (Hymenoptera, Formicidae). Revue de l’Association Roussillonnaise d’Entomologie 112:163-167. PDF
Finnegan, R. J. 1966. An unusual species of ant, Formica fossaceps Buren, in Quebec. Canada Forestry Branch. Bimonthly Research Notes 22(6):4.
Emery, C. 1907. Una formica nuova italiana spettante ad un nuovo genere. Rendiconti delle Sessioni della Reale Accademia delle Scienze dell'Istituto di Bologna (n.s.)11:49-51.

Notes: Session of 12 May 1907.

Emery, C. 1915d. Sur le type de Camponotus maculatus (Formica maculata F.) (Hym. Formicidae). Bulletin de la Société Entomologique de France 1915:79-80. PDF
Dufour, L. 1864. Note sur une nouvelle espèce de fourmi (Formica Vinsonnella). Annales de la Société Entomologique de France (4)4:210. PDF
Dlussky, G. M. 1967b. Ants of the genus Formica from the Baltic amber. [In Russian.]. Paleontologicheskii Zhurnal 1967(2):80-89. PDF

Notes: Date signed for printing ("podpisano k pechati"). Translated in Paleontol. J. 1(2):69-77. See Dlussky (1967c).

Crawley, W. C. 1911. Formica fusca, L., var. glebaria, Nyl., a form new to Britain. Entomologist's Record and Journal of Variation 23:96.
Cole, A. C., Jr. 1943a ("1942"). Synonyms of Formica difficilis Emery (Hymenoptera: Formicidae). Annals of the Entomological Society of America 35:389. PDF
Cole, A. C., Jr. 1947 ("1946"). A description of Formica parcipappa, a new ant from Idaho (Hymenoptera: Formicidae). Annals of the Entomological Society of America 39:616-618. PDF
Buren, W. F. 1968a. Some fundamental taxonomic problems in Formica (Hymenoptera: Formicidae). Journal of the Georgia Entomological Society 3:25-40. PDF