Okonjo-Iweala, Ngozi (1981). Credit policy, rural financial markets, and Nigeria's agricultural development (Thesis) (dalam bahasa Inggeris). Massachusetts Institute of Technology. hdl:1721.1/46400. OCLC08096642.
Okonjo-Iweala, Ngozi (1981). Credit policy, rural financial markets, and Nigeria's agricultural development (Thesis) (dalam bahasa Inggeris). Massachusetts Institute of Technology. hdl:1721.1/46400. OCLC08096642.