Zalukhu, S., A. T. Harefa, and Y. Waruwu. “Increasing the Students Ability in Vocabulary Mastery by Using Flash Card at the Eighth Grade of SMP Negeri 1 Gido in 2022/2023”. Journal of Education Research, vol. 4, no. 3, Sept. 2023, pp. 1443-8, doi:10.37985/jer.v4i3.433.