Novaliyosi, Novaliyosi, Burhanuddin Tola, and Wardani Rahayu. “TRENDS OF MATHEMATICAL LOGICAL THINKING ABILITYTHROUGH THE CRA (CONCRETE-REPRESENTATIONAL-ABSTRACT) APPROACHWITH PORTFOLIO ASSESSMENT”. IJER - INDONESIAN JOURNAL OF EDUCATIONAL REVIEW 6, no. 2 (January 30, 2020). Accessed May 8, 2024. https://journal.unj.ac.id/unj/index.php/ijer/article/view/14077.