Wisitthipong, Woravalan, 		Rahmawati, Yossi, AND 		Simpol, Wanida.
" APPLYING OF THE FLIPPED CLASSROOM CONCEPT  TO  DEVELOP LEARNING ACHIEVEMENT IN ENGLISH LANGUAGES OF GRADE 4 STUDENTS IN COVID-19 SITUATION" <em>Journal Universitas Muhammadiyah Gresik Engineering, Social Science, and Health International Conference (UMGESHIC)</em> [Online], Volume 1 Number 2 (20 December 2021)