Saidah, Siti. “Discovery Learning to Improve English Achievement: A Classroom Action Research to the Seventh Graders of SMPN 1 Kedung Jepara”. IJOLTL (Indonesian Journal of Language Teaching and Linguistics), vol. 5, no. 2, May 2020, pp. 109-22, doi:10.30957/ijoltl.v5i2.622.