Fatimah, S. . “THE EFFECT OF CONCEPT GAMIFICATION IN LEARNING ENGLISH VOCABULARY”. Prosiding Seminar Nasional Pendidikan Universitas Subang (SENDINUSA), vol. 3, no. 1, June 2022, pp. 268-70, https://ejournal.unsub.ac.id/index.php/sendinusa/article/view/1317.