International Registry of World Citizens. (2001). Register van Wereldburgers: Nieuwsbrief. Hove: International Registry of World Citizens.
Chicago-viite (17. p.)International Registry of World Citizens. Register Van Wereldburgers: Nieuwsbrief. Hove: International Registry of World Citizens, 2001.
MLA-viite (8. p.)International Registry of World Citizens. Register Van Wereldburgers: Nieuwsbrief. Hove: International Registry of World Citizens, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.