E. I. Okpokwu, M. Agu, and C. Akusu, “Health Risk Assessment of Heavy Metal Concentrations in Sewage Compost Manure Used for Agriculture in Zaria, Nigeria”, NJP, vol. 35, no. 3, pp. 307–314, Jul. 2026, doi: 10.62292/njp.v35i3.2026.606.