Asmaningrum, H. P., J. Jusmiati, J. J. Pongkendek, and M. L. Kristyasari. “Validation of Environmental Chemistry Teaching Materials on the Topic of Environmental Pollution Using an Ethno-Stem Approach”. Jurnal Ilmiah Kanderang Tingang, Vol. 13, no. 2, Dec. 2022, pp. 235-4, doi:10.37304/jikt.v13i2.174.