P. Kitundu, M., N. Msuya, and Z. Katima. “Production of Potassium-Rich Biofertilizer from Composted Banana Peels and Watermelon Rinds ”. Tanzania Journal of Engineering and Technology, vol. 44, no. 1, May 2025, pp. 118 -36, doi:10.52339/tjet.v44i1.1128.