Ekpe, Bassey (2007). "The Intelligence Assets of the United Nations: Sources, Methods, and Implications". International Journal of Intelligence and CounterIntelligence. 20 (3): 377–400. doi:10.1080/08850600701249709. S2CID154493112.
Ekpe, Bassey (2007). "The Intelligence Assets of the United Nations: Sources, Methods, and Implications". International Journal of Intelligence and CounterIntelligence. 20 (3): 377–400. doi:10.1080/08850600701249709. S2CID154493112.