UMEOKWE, Eucharia Chikwuo. DEVELOPMENT, VALIDATION AND USE OF PRINCIPALS’ LEADERSHIP BEHAVIOURS MEASURING INSTRUMENT FOR SECONDARY SCHOOLS IN SOUTH EAST NIGERIA. African Journal of Behavioural and Scale Development Research, [S. l.], v. 4, n. 1, 2022. DOI: 10.58579/AJB-SDR/4.1.2022.42. Disponível em: https://ojs.abreap.org/index.php/journal/article/view/108. Acesso em: 5 nov. 2025.