Attah, LE, and MB Regasa. 2013. “Assessment of Heavy Metals, PH and EC in Effluent Run-Off, River and Adjacent Soil Around a Floriculture Industry in Holeta, Wadera District, Ethiopia”. Ethiopian Journal of Environmental Studies and Management 6 (6):620-29. https://doi.org/10.4314/ejesm.v6i6.5.