Faif, Chairil. “Analyzing Elementary School Students’ Geometry Comprehension Based on Van Hiel’s Theory”. SELL (Scope of English Language Teaching, Linguistics, and Literature) Journal, vol. 11, no. 1, Feb. 2026, pp. 9-22, http://publikasi.stkippgri-bkl.ac.id/index.php/SL/article/view/1282.