Jelita Sirait, Lisbet Novianti Sihombing, and Sukardo Sitohang, “The Influence of Letter Card Media on Learning Outcomes of Class 1 Students in Learning Theme 1 Myself Subtema 2 Me and New Friends at SDN 091277 Pematang Siantar”, IJIST, vol. 1, no. 4, pp. 431–440, Oct. 2023.