Abdulla, Osama A. “Determinants of Post-Vaccination Antibody Titers to PPR Vaccine in Sheep: A Cross-Sectional Statistical Study”. American Journal of Biomedicine and Pharmacy, vol. 2, no. 9, Sept. 2025, pp. 38-45, https://biojournals.us/index.php/AJBP/article/view/1424.