 Ngozi_Okonjo-Iweala  Sallah, Tijan; Okonjo-Iweala, Ngozi 2003. Chinua Achebe: Teacher of Light, A Biography. Trenton, NJ: Africa World Press. ISBN 978-1-59221-031-2. LCCN 2002152037. OCLC 50919841. OL 3576773M. 