HURTADO, Luis. Assigned and Observed Difficulty of the Questions on an Academic Achievement Test . Revista Estudios Psicológicos, [S. l.], v. 1, n. 4, p. 80–101, 2021. DOI: 10.35622/j.rep.2021.04.004. Disponível em: https://revistas.inudi.edu.pe/rep/article/view/958. Acesso em: 6 jul. 2026.