Nwangwu, Chikodiri, and Adaeze Olihe Ononogbu. “National Security and Sustainable Economic Development in Nigeria since 1999: Implication for the Vision 20:2020”. Journal of Educational and Social Research, vol. 4, no. 5, Sept. 2014, p. 129, https://www.richtmann.org/journal/index.php/jesr/article/view/4401.