Agustina, Syintia Dwi, et al. “Extraction of Catechins from Areca Catechu L.Peel With Different Solvent Type for Feed Additive of Broiler”. International Journal of Environment, Agriculture and Biotechnology, vol. 5, no. 6, Nov. 2019, https://journal-repository.com/index.php/ijeab/article/view/1429.