Wongsrikaew, W. et al. 2021. EFFECTS OF ENGLISH INSTRUCTION USING THE FLIPPED CLASSROOM CONCEPT TO DEVELOP SPEAKING SKILL OF GRADES 1 - 3 IN COVID-19 SITUATION. Journal Universitas Muhammadiyah Gresik Engineering, Social Science, and Health International Conference (UMGESHIC). 1, 2 (Dec. 2021), 313–322. DOI:https://doi.org/10.30587/umgeshic.v1i2.3398.