N, A. K. . Electronic Payment System and Poor Fees Collection in Universities in South Eastern States of Nigeria. International Journal on Economics, Finance and Sustainable Development, [S. l.], v. 4, n. 8, p. 125–137, 2022. DOI: 10.31149/ijefsd.v4i8.3445. Disponível em: https://journals.researchparks.org/index.php/IJEFSD/article/view/3445. Acesso em: 2 oct. 2026.