NWEKE, E. O.; UMANAH, R. G. ROLE DIFFERENTIATION AND JOB PERFORMANCE OF ADMINISTRATIVE STAFF IN TERTIARY INSTITUTIONS IN RIVERS STATE. African Journal of Management and Business Research, [S. l.], v. 3, n. 1, p. 59–72, 2022. Disponível em: https://publications.afropolitanjournals.com/index.php/ajmbr/article/view/53. Acesso em: 27 oct. 2026.