Atsango, V. . “Effects of Internal School Environment on Learners’ Academic Performance in Public Secondary Schools in Khwisero Sub-County Kenya”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 60, no. 4, Dec. 2021, pp. 304-16, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/13537.