Oktyas Wahyu Kurniawati, Nuriman, and Kendid Mahmudi, “ANALYSIS OF THE FIFTH GRADE STUDENTS’ HIGHER ORDER THINKING SKILLS ON SCIENCE IN THE ECOSYSTEM THEME AT ELEMENTARY SCHOOLS”, JPFKIP, vol. 9, no. 3, pp. 313–322, Jun. 2020, doi: 10.33578/jpfkip.v9i1.7866.