“ PROFILE CONCEPTUAL UNDERSTANDING OF SECONDARY SCHOOL STUDENTS ASSOCIATED WITH CONCEPTUAL CHANGE REGARDING MATERIAL CHANGES”. Jurnal Pengajaran Matematika Dan Ilmu Pengetahuan Alam, vol. 24, no. 1, Apr. 2019, pp. 22-27, https://doi.org/10.18269/jpmipa.v24i1.17721.