«Metal Contents and Acute Toxicity of Combined Vernonia amygdalina Leaves and Garcinia kola Seeds-VAGK, a Herbal and Nutritional Formulation in Male Wistar Rats» (2019) African Journal of Biomedical Research, 22(2), сс. 187–194. доступно на: https://ojshostng.com/index.php/ajbr/article/view/2260 (просмотрено: 5 апрель 2026).