Etuk, Idorenyin Udo, and Nnana Aripko Nneoyi. “Management Collaboration and Performance of Service Institutions in the Nigeria Airspace Management Agency, Calabar”. African Journal of Management and Business Research, vol. 18, no. 1, Jan. 2025, pp. 1-19, https://doi.org/10.62154/ajmbr.2025.018.010585.