1. Wang LK, Pereira NC, Hung YT, Shammas NK (2009) Biological treatment processes. Humana, Totowa, NJ, 818 pp
2. Wang LK, Shammas NK, Hung YT (2009) Advanced biological treatment processes. Humana, Totowa, NJ, 738 pp
3. U.S. EPA (2000) Trickling filter-wastewater technology fact sheet. U.S. Environmental Protection Agency, EPA 832-F-00-014, Office of Water, Washington, DC. September 2000
4. U.S. EPA (2000) Trickling filter nitrification-wastewater technology fact sheet. U.S. Environmental Protection Agency, EPA 832-F-00-015, Office of Water, Washington, DC. September 2000
5. NSW Plastics (2009) SESSIL trickling filter media-vertical plastic strip media. Roanoke, VA.
http://www.nswplastics.com/environmental/pdfs/sessil_flyer.pdf