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Paraschivescu, D. 1961. Contributii la cunoasterea formicidelor din stepa si podisul Dobrogei. Studii si Cercetari de Biologie. Seria Biologie Animala 13:457-465.
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Paraschivescu, D. 1963. Cercetari zoogeografice asupra formicidelor din bazinul Trotusului. Comunicarile Academiei Republicii Populare Române 13:559-566. PDF
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Paraschivescu, D. 1967. Cercetari asupra faunei de Formicide din regiunea Portile de Fier. Studii si Cercetari de Biologie. Seria Zoologie 19:393-403. PDF
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Paraschivescu, D. 1974. Die Fauna der Formiciden in dem Gebiet um Bukarest. Travaux du Muséum d'Histoire Naturelle "Grigore Antipa" 15:297-302.
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Paraschivescu, D. 1972a. Fauna mirmecologica din zonele saline ale României. Studii si Cercetari de Biologie. Seria Zoologie 24:489-495. PDF
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O'Rourke, F. J. 1945. A further extension of the range of Myrmica schenki, Emery. Entomologist's Record and Journal of Variation 57:85-86. PDF
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O'Rourke, F. J. 1979. The social Hymenoptera of County Wexford. Proceedings of the Royal Irish Academy. Section B 79:1-14.
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O'Rourke, F. J. 1950a. The distribution and general ecology of the Irish Formicidae. Proceedings of the Royal Irish Academy. Section B 52:383-410.
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O'Rourke, F. J. 1950b. Myrmecological notes from Narvik, northern Norway. Norsk Entomologisk Tidsskrift 8:47-50. PDF
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Ortiz, F. J.; Tinaut, A. 1988. Formícidos del litoral granadino. Orsis (Organismes i Sistemes) 3:145-163.
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Osgood, W. H. 1914. Dates for Ovis canadensis, Ovis cervina, and Ovis montana. Proceedings of the Biological Society of Washington 27:1-3.

Notes: Provides evidence on the date of publication of Latreille (1804).

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Oster, G. F.; Wilson, E. O. 1978. Caste and ecology in the social insects. Princeton: Princeton University Press, xv + 352 pp.
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