Astuti, E., M. Rahayuningsih, and S. Ngabekti. “Development of Project-Based Learning Guide on Pollution and Environmental Conservation Material at SMA 1 Jekulo Kudus”. Journal of Innovative Science Education, Vol. 7, no. 2, Aug. 2018, pp. 215-22, doi:10.15294/jise.v7i2.25021.