Helmi, N. Y. Rustaman, F. S. Tapilouw, and T. Hidayat. “Students’ Concept Mastery: Reasoning Ability and Concept Mastery of Evolution”. Indonesian Journal of Social Research (IJSR), Vol. 1, no. 1, Aug. 2019, pp. 23-29, doi:10.30997/ijsr.v1i1.7.