Olaleye, A.A.O., Ogunkunle, A.O., Singh, B.N. (2005): Nutrient dynamics in wetlands in Nigeria. In: Floodplains: Hydrology, Soils, Fauna and their Interactions, 11 to 16 September 2005, Görlitz, Germany, Abstracts and List of Participants: 17.
Olechowicz, E. (1977): The effect of coprophages on faeces decomposition in a pasture ecosystem. Ecological Bulletins, 25 (Soil Organisms as Components of Ecosystems): 553-556.
Oliveira, I.S., Read, V.M.S.J., Mayer, G. (2012): A world checklist of Onychophora (velvet worms), with notes on nomenclature and status of names. ZooKeys, 211: 1–70.
Oliveira, I.S., Schaffer, S., Kvartalnov, P.V., Galoyan, E.A., Palko, I.V., Weck-Heimann, A., Geißler, P., Ruhberg, H., Mayer, G. (2013):A new species of Eoperipatus (Onychophora) from Vietnam reveals novel morphological characters for the South-East Asian Peripatidae. Zoologischer Anzeiger, 252: 495–510.