Não informado. (2022). Public Transport International. International Union of Public Transport.
Chicago-viite (17. p.)Não informado. Public Transport International. Bruxelles: International Union of Public Transport, 2022.
MLA-viite (8. p.)Não informado. Public Transport International. International Union of Public Transport, 2022.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.