1. Addicott, J. F., 1974. Predation and prey community structure: an experimental study of the effect of mosquito larvae on the protozoan communities of pitcher plants. Ecology 55: 475?492.
2. Bateman, L. E., 1975. An ecological study of hummock-hollow formations on certain peatlands of the Avalon Peninsula, Newfoundland, with special emphasis on the rotifera. M.Sc. Thesis, Memorial University of Newfoundland, 131 pp.
3. Bradshaw, W. E. & R. A. Creelman, 1984. Mutualism between the carnivorous purple pitcher plant Sarracenia purpurea and its inhabitants. Am. Midl. Nat. 112: 294?304.
4. Donner, J., 1949. Rotatorien der Humusb�den, �sterreich zool. Zeitschr. 2: 117?151.
5. Donner, J., 1965. Ordnung Bdelloidea. Akademie-Verlag, Berlin, 297 pp.