Ningrum, R.W. et al. 2020. Microtremor Data to Strengthen the Students Mastery of Materials in the Implementation of Integrated Physics Learning. Jurnal Penelitian Fisika dan Aplikasinya (JPFA). 10, 1 (Sep. 2020), 81–89. DOI:https://doi.org/10.26740/jpfa.v10n1.p81-89.