著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
International Civil Aviation Organization,Maintenance of competence (flight crew) = Maintien de la competence (equipage de conduite) = Mantenimiento de la competencia(Tripulacion de vuelo),,International Civil Aviation Organization,1968,ICAO circular,,,,https://cir.nii.ac.jp/crid/1130000798309781632