1. Alsterberg, G. - 1926 - Die Winkler'sche Bestimmungsmethode für in Wasser gelösten, elementaren Sauerstoff sowie ihre Anwendung bei Anwesenheit oxydierbarer Substanzen; Biochem. Z. 170: 30–75.
2. American Public Health Association - Standard methods for the examination of water, sewage, and industrial wastes. Tenth Edn. New York, 1955.
3. Beadle, L. C. - 1932 - Scientific results of the Cambridge Expedition to the African Lakes, 1930–1. IV The waters of some East African lakes in relation to their fauna and flora; J. Linn. Soc. (Zool.) 38: 157–211.
4. Beadle, L. C. & Lind, E. M. - 1960 - Research on the swamps of Uganda; Uganda J. 24: 84–98.
5. Beadle, L. C. & Nilsson, J. R. - 1960 - The effects of anaerobic conditions on two Heterotrich Ciliate Protozoa from papyrus swamps; J. exp. Biol. 36: 1–8.