Richardson, H. (1900): Synopses of North-American invertebrates. VIII. The isopoda. Part II. Asellota, Oniscoidea, Epicaridea. Am. Naturalist, 34: 295-309.
Richter, T.A. (1999): The effects of density-dependent offspring mortality on the synchrony of reproduction. Evolutionary Ecology, 13: 167-172.
Richters , F. (1926):Tardigrada. In: Krumbach , T. (ed.): Handbuch der Zoologie, 3: Arthropoda ex. Insecta. 1. Hälfte: Tardigrada, Pentastomida, Myzostomida, Arthropoda: Allgemeines, Crustacea. Walter de Gruiter & co., Berlin: 1-68.
Rickfelder, T. (2002): Habitat selection of Bembidini (Col. Carabidae) and their potential as umbrella species. In: Szyszko, J., Den Boer, P.J., Bauer, T. (eds.): How to protect or what we know about Carabid Beetles. X European Carabidologist Meeting, Tuczno 2001. Warsaw Agricultural Univ. Press, Poland: 77-94. (ve sborníku)
Rico-Gray, V., Oliveira, P.S. (2007):The Ecology and Evolution of Ant-Plant Interactions. University of Chicago Press.
