Olivier, A. G. 1792. Encyclopédie méthodique. Histoire naturelle. Insectes. Tome 6. (pt. 2). Paris: Panckoucke, pp. 369-704.

Notes: Publication date from Sherborn & Woodward (1906b:577). Ants pp. 469-506.

Olsen, O. W. 1934. Notes on the North American harvesting ants of the genus Pogonomyrmex Mayr. Bulletin of the Museum of Comparative Zoology 77:493-514. PDF
Onoyama, K. 1989c. Three ants (Hymenoptera: Formicidae) new to Hokkaido, Japan. Japanese Journal of Entomology 57:604.