ADAM, Umar Ayotunde; OWOLABI, Tunde; LAMEED, Soladoye; UBAKA, Christiana; JOY, Abolaji Toyin. Decoding Difficulty: A Quantitative Analysis of Difficult Concept in the Biology Curriculum. Journal of Educational Sciences, [S. l.], v. 8, n. 4, p. 570–581, 2024. DOI: 10.31258/jes.8.4.p.570-581. Disponível em: https://jes.ejournal.unri.ac.id/index.php/JES/article/view/98. Acesso em: 23 may. 2026.