International records / US diplomatic cables (WikiLeaks)
NIGERIAN PETROLEUM SALES TO AFRICAN NATIONS IN ARTICLE APPEARING IN WINTER 1977-78 EDITION OF "FOREIGN POLICY" MAGAZINE ENTITLED "DATELINE NIGERIA" AUTHOR JEAN HERSKOVITS SAYS QUOTE: YET DESPITE OPEC MEMBERSHIP
LIMITED OFFICIAL USE cable from Department of State to Vienna, Austria | Lagos, Nigeria
