International records / US diplomatic cables (WikiLeaks)
NIGERIA: YAKUBU GOWON DISCUSSES BOKO HARAM, ELECTORAL REFORM, PFIZER
CONFIDENTIAL cable from Abuja, Nigeria to Yaoundé, Cameroon | Central Intelligence Agency | Defense Intelligence Agency | Department of Energy | Economic Community of West African States (ECOWAS) | Joint Analysis Center Molesworth | National Security Council | Lagos, Nigeria | Secretary of State | Pretoria, South Africa | United States Africa Command | United States European Command