Juliana, Darinda Sofia Tanjung, Charles Andre F. Nieves, and Dinesh Elango, “Implementing pop-up book-assisted STAD cooperative learning model to improve students’ descriptive writing skills”, JPFKIP, vol. 14, no. 4, pp. 528–538, Aug. 2025, doi: 10.33578/jpfkip.v14i4.p528-538.