Okodugha, Victory Omozejele, et al. “Chemical Profiling of Piper Nigrum L. Leaves: Vitamin Quantification, Phytochemical Screening, and HPLC Identification of Major Flavonoids”. FUDMA Journal of Sciences, vol. 10, no. 14, Aug. 2026, pp. 361-6, https://doi.org/10.33003/fjs-2026-1014-5674.