กิจประทีปธรรมพ.; กล้าหาญร.; แดงเรืองอ. Development of academic achievement in history subjects On current world events (important events in the 21st century) Of students in grade 4/5 of ratchaprachanukhro school 31 using the tutorial. Journal of Teaching Science, v. 1, n. 1, 14 mar. 2023.