TY  - JOUR
AU  - Asrinaldi
TI  - Learning Effectiveness Using Picture and Picture Model to Improve Understanding of The Concept Substance And Change for Class VII Students of SMP
JO  - Journal of Indonesian Science Teachers
PY  - 2025
VL  - 3
IS  - 1
UR  - https://jistdev.unri.ac.id/publications/019be933-933c-736e-ab50-bbc1949c56d0
ER  -