Organization of Arab Petroleum Exporting Countries (OAPEC) - "Objectives and activities" by M. H. Taher, 1975, Box: 21, Folder: 23. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/493107 Accessed April 26, 2024.