“Soybean reaction to the utilization of poultry manure and Phosphorus fertilizer in the Sub-humid Savanna of Nigeria” (2012) International Journal of Manures and Fertilizers, 1(1), pp. 43–49. Available at: https://www.ijpp.org/journal/index.php/ijmf/article/view/266 (Accessed: 4 April 2026).