A. M. Okafor and J. N. Okoli, “EFFECT OF FLIPPED CLASSROOM INSTRUCTIONAL STRATEGY ON STUDENTS’ ACADEMIC ACHIEVEMENT AND INTEREST IN BIOLOGY IN SECONDARY SCHOOLS IN NNEWI EDUCATION ZONE”, IJPAER, vol. 2, no. 04, pp. 30–46, Jul. 2026, doi: 10.5281/zenodo.21580415.