AHIAKWO, M. J.; ENE, M. O. University first year chemistry students’ and teachers’ perception of difficulty of select topics in organic chemistry in rivers state of Nigeria. African Journal of Chemical Education, [S. l.], v. 12, n. 1, p. 82–94, 2022. Disponível em: https://www.ajol.info/index.php/ajce/article/view/221314. Acesso em: 21 sep. 2026.