D. M. Fortune, M. S. Fofanah, and I. M. Conteh , Trans., “Assessing the Level of Comprehension of Chemical Formulae and Equations Among Secondary School Students in Bo City, Southern  Region of Sierra Leone”, int.jour.sci.res.mana, vol. 13, no. 05, pp. 4087–4097, May 2025, doi: 10.18535/ijsrm/v13i05.el03.