KALUNTA, C. G. “Antimicrobial Effect of Different Seed Extracts of Piper Nigrum Against Escherichia Coli, Staphylococcus Aureus and Candida Albican”. Biotechnological Research, Vol. 3, no. 3, Sept. 2017, pp. 71-76, http://br.biomedpress.org/index.php/br/article/view/751.