Umeokwe, E.C. 2022. DEVELOPMENT, VALIDATION AND USE OF PRINCIPALS’ LEADERSHIP BEHAVIOURS MEASURING INSTRUMENT FOR SECONDARY SCHOOLS IN SOUTH EAST NIGERIA. The African Journal of Behavioural and Scale Development Research. 4, 1 (Feb. 2022). DOI:https://doi.org/10.58579/AJB-SDR/4.1.2022.42.