NWOBASI CHUKWUDI SAMUEL & NWANI PIUS OKORIE. VIDEOTAPE INSTRUCTIONAL PACKAGE AND ITS EFFECT ON STUDENTS’ ACHIEVEMENT AND RETENTION OF CONCEPTS IN CHEMISTRY AT SECONDARY SCHOOLS. International Journal of Research Science and Management, [S. l.], v. 7, n. 10, p. 1–9, 2020. Disponível em: http://ijrsm.com/index.php/journal-ijrsm/article/view/151. Acesso em: 22 dec. 2024.