Ramos, J. A. 1946. The insects of Mona Island (West Indies). Journal of Agriculture of the University of Puerto Rico 30:1-74. PDF
Ran, H.; Zhou, S. 2011. Checklist of Chinese ants: the formicomorph subfamilies. Journal of Guangxi Normal University, Natural Science Edition 29 (3):65-73.
Randuska, P. 1995. Formikofauna SPR Boky. Entomofauna Carpathica 7:20-26.
Rangel Ch., J. O. (ed.) 1994. Ucumarí. Un caso típico de la diversidad biótica andina. Pereira, Colombia: CARDER (Corporación Autónoma Regional de Risaralda), 451 pp.
Raqué, K.-F. 1994. Die Ameisenfauna der Sandhausener Dünen. Beihefte zu den Veröffentlichungen für Naturschutz und Landschaftspflege in Baden-Württemberg 80:241-254.

Notes: Not seen. Cited in Zoological Record, volume 132.

Räsänen, V. 1915. Stridulationsapparate bei Ameisen besonders bei Formicidae. Acta Societatis pro Fauna et Flora Fennica 40(8):1-19.
Rasnitsyn, A. P. 1975. Hymenoptera Apocrita of Mesozoic. [In Russian.]. Trudy Paleontologicheskogo Instituta. Akademiya Nauk SSSR 147:1-134.

Notes: Date signed for printing ("podpisano k pechati").

Rasnitsyn, A. P. 1980. Origin and evolution of Hymenoptera. [In Russian.]. Trudy Paleontologicheskogo Instituta. Akademiya Nauk SSSR 174:1-192.

Notes: Date signed for printing ("podpisano k pechati").

Rasnitsyn, A. P.; Quicke, D. L. J. (eds.) 2002. History of insects. Dordrecht: Kluwer, 517 pp.
Ravasini, G. 1923. Un'escursione coleotterologica sul Monte Cavallo ed al Cansiglio. Rassegna della Società Alpina delle Giulie 24:26.