Olatunji, Taiwo Isaac, and Tajudeen Adewumi Adebisi. “Comparative Analysis of Operational Structures in Single- and Dual-Mode Distance Learning Institutions in Nigeria”. The International Review of Research in Open and Distributed Learning 22, no. 1 (March 11, 2021): 59–77. Accessed March 28, 2024. https://www.irrodl.org/index.php/irrodl/article/view/5120.