Sinambela, Erika, Carolina Pakpahan, and Poster Sagala. “Training of Improving Students’ Speaking Skills by Using Talking Ball Game at SMA Kalam Kudus Medan”. JURNAL ABDIMAS MADUMA 1, no. 1 (September 15, 2022): 69–76. Accessed April 18, 2026. https://www.journal.eltaorganization.org/index.php/ecdj/article/view/103.