Jintakosol, T., and W. Nitayaphat. “Coating Ag2S Films on Silver Jewelry by Electrochemical Method”. Journal of Materials Science and Applied Energy, Vol. 10, no. 2, Apr. 2021, pp. 41 -48, https://ph01.tci-thaijo.org/index.php/jmsae_ceae/article/view/242673.