„Metal Contents and Acute Toxicity of Combined Vernonia amygdalina Leaves and Garcinia kola Seeds-VAGK, a Herbal and Nutritional Formulation in Male Wistar Rats“, AJBR, let. 22, št. 2, str. 187–194, maj 2019, Pridobljeno: 25. april 2026. [Na spletu]. Dostopno na: https://ojshostng.com/index.php/ajbr/article/view/2260