Prayitno A, Rossa A, Widayanti FD. Level penalaran proporsional siswa dalam memecahkan missing value problem. J. ris. pendidik. mat [Internet]. 2019 Nov. 28 [cited 2025 May 10];6(2):177-8. Available from: https://journal.uny.ac.id/index.php/jrpm/article/view/19728