„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), str. 187–194. Dostopno na: https://ojshostng.com/index.php/ajbr/article/view/2260 (Pridobljeno: 25 april 2026).