Santoso, Rachma Devita, and Rusly Hidayah. “The Validity of Blended Learning Oriented Student Worksheets to Improve Science Process Skills in Electrolyte and Non-Electrolyte Solution Materials”. Chemistry Education Practice, vol. 4, no. 2, Aug. 2021, pp. 171-8, doi:10.29303/cep.v4i2.2394.