Rais , M. ., M. . Yahya, J. . Jamaluddin, and P. . Purnamawati. “Comparing Project-Based Learning and Problem-Based Learning to Foster 21st-Century Learning Skills in Agricultural Seaweed Product”. Cypriot Journal of Educational Sciences, vol. 16, no. 3, June 2021, pp. 1217-30, doi:10.18844/cjes.v16i3.5842.