Siddig, Nahid A.A., Asma A. Ahmed, Sarra A.M. Saad, and Faisal Hammad Mekky Koua. 2019. “Heavy Metals Accumulation from Sewage Sludge in the Nile Tilapia Oreochromis Niloticus (Trewavas, 1983) During a Sludge-Earthworm-Fish Short-Term Cycling”. Italian Journal of Food Safety 8 (1). https://doi.org/10.4081/ijfs.2019.7257.