[1]
Daniel Ganda Putra Sihombing, David Togi Hutahaean, Yanti kristina Sinaga, Tiarma Intan Marpaung, and Anita Sitanggang, “The Effect Of Reinforcement On Writing Skill At Eleventh Grade Students In SMK Negeri 1 Pematang Siantar ”, JIPSI, vol. 2, no. 3, pp. 381–389, Oct. 2023.