Kaka’an, I. , Smolianov, P. , Lian, D. , Dion, S. , Schoen, C. , Norberg, J.. "Nigerian Football System: Examining Meso-Level Practices against a Global Model for Integrated Development of Mass and Elite Sport". World Academy of Science, Engineering and Technology, Open Science Index 153, International Journal of Sport and Health Sciences, (2019), 13(9), 1266 - 1273.