Motivation and Teachers Effectiveness in the Class Work in Ughelli North Local Government Area of Delta State. Global Journal of Management and Business Research, [S. l.], v. 17, n. A3, p. 9–17, 2017. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/2209. Acesso em: 19 feb. 2026.