Pratiwi, I. S., and E. Sudihartinih. “The Analysis of Junior High School Students’ Mathematical Connection on The Ratio and Proportion Concepts”. Edumatika : Jurnal Riset Pendidikan Matematika, vol. 4, no. 1, May 2021, pp. 59-76, doi:10.32939/ejrpm.v4i1.753.