Insani, N., N. Fadiawati, R. B. Rudibyani, and M. M. Fauzi Syamsuri. “Using Project-Based Learning in Improving Students’ Critical Thinking Skills to Separate of Mixtures”. IJCER (International Journal of Chemistry Education Research), vol. 2, no. 2, Aug. 2018, pp. 84-88, doi:10.20885/ijcer.vol2.iss2.art5.