1. Batyk, I.M. (2012). Tourist management of protected areas – The case of Biebrza national park. Infrastructure and Ecology of Rural Areas, 2/III/, 207–216 (in Polish).
2. Bergier, T., Czech, A., Czupryński, P., Łopata, A., Wachniew, P. & Wojtal, J. (2002). Plant sewage treatment plants. A guide for municipalities. Natural Systems. Kraków, 25–36 (in Polish).
3. Börner, X., Felde, K., Kunst, S., & Wissing, F. (1998). Germany. In J. Vymazal, H. Brix, P.R. Cooper, M.B. Green, & R. Haberl (Eds.), Constructed wetlands for wastewater treatment in Europe (pp. 67–76). Leiden: Backhuys Publishers.
4. Brix, H., Arias, C.A., & Johansen, N.H. (2003). Experiments in a two-stage constructed wetland system: Nitrification capacity and effects of recycling on nitrogen removal, wetland-nutrient, metal and mass cycling. In J. Vymazal (Ed.), Wetlands – Nutrients, metals and mass cycling (pp. 237–258). Leiden: Backhuys Publishers,
5. Bus, A., & Karczmarczyk, A. (2014). Properties of lime-siliceous rock opoka as reactive material to remove phosphorous from water and wastewater. Infrastructure and Ecology of Rural Areas. Nr 2014/ II, 227–238 (in Polish)