Wanjira, K. и Wanjiru, B. 2025. Interrelation between cognitive development and personality traits among adolescent boys: A study in public day secondary schools in Kirinyaga East Sub‑County, Kenya. Russian Journal of Education and Psychology. 16, 5 (окт. 2025), 356-375. DOI:https://doi.org/10.12731/2658-4034-2025-16-5-831.