(1)
Widyastri, R. A.; Hasibuan, V. U. MASTERING STUDENT WORKSHEETS (LKS) ON WATER RECYCLING MATERIALS USING CONTEXTUAL TEACHING AND LERANING MODELS TO IMPROVE CLASS V STUDENT LEARNING OUTCOMES SDIT AL-KHAIR DELI SERDANG DISTRICT Q.A 2019 2020. REKOGNISI 2020, 5, 39-49.