TY - GEN A1 - Martin, Martin ID - repository24713 TI - The Influence of Multiple Representation-Based Online Lectures Using Geogebra on Understanding of Students' Thermodynamics Concepts During the Covid-19 Pendemic Period AV - public PB - AL-ISHLAH: Jurnal Pendidikan UR - http://repository.uhamka.ac.id/id/eprint/24713/ ER -