@techreport{UNESCO(UnitedNationsEducational:1993,
      author        = "UNESCO (United Nations Educational, Scientific and
                       Cultural Organization)",
      title         = "{Global Citizenship Education. Preparing Learners for the
                       Challenges of the 21st Century}",
      number        = "DEEEP-REPORT-2018-046. DE-UN-6",
      year          = "2014",
}