Sonsiri, A. ., U. . Inkampa, N. Amdee, and T. . Maneesaeng. “Effect and Optimal Variable of Mangosteen Peel Powder for Green Sand Mold”. RMUTP Research Journal Sciences and Technology, vol. 14, no. 1, June 2020, pp. 26-36, doi:10.14456/jrmutp.2020.3.