"Nafṭ wa-al-taʻāwun al-ʻArabī." . . "Naft̀ wa-al-taʻāwun al-ʻArabī" . . . . . . . . . . . . . . . . . "Sources and problems of Arab development" . "Sources and problems of Arab development"@en . . . "Arabische Staaten." . . "Organization of Arab Petroleum Exporting Countries" . . "Arab countries" . . "Wirtschaftsentwicklung." . . . .