1. Aleinikova, M. M. (1965): Die Bodenfauna des Mittleren Wolgalandes und ihre regionalen Besonderheiten. Pedobiologia 5, 17–49.
2. Aleinikova, M. M. (1968): The regularities of the landscape distribution of soil invertebrates in the Middle Volga Region. Zool. journ., v. XLII, No. 7, 1022–1034 (in Russian).
3. Balogh, J. (1958): Lebensgemeinschaften der Landtiere. Akademie Verlag, Berlin, 560 S.
4. O’Connor, F.B. (1955) : Extraction of enchytraeid worm from a coniferous forest soil. Nature, Vol. 175, N 4462, 815–816.