The Relationship between Manpower Development and Lecturersa Productivity in Colleges of Education in Delta State. Global Journal of Management and Business Research, [S. l.], v. 16, n. A10, p. 65–77, 2016. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/101278. Acesso em: 19 feb. 2026.