Audes Kristiani Harefa et al. 2026. THE EFFECT OF JOYFUL LEARNING ON STUDENTS VOCABULARY MASTERY AT SMPN 4 GUNUNGSITOLI SELATAN. JEdu: Journal of English Education. 6, 2 (Jul. 2026), 131–139. DOI:https://doi.org/10.30998/jedu.v6i2.1970.