Não informado. (1947). Traffic quarterly. Eno Foundation for Transportation.
Chicago-viite (17. p.)Não informado. Traffic Quarterly. Westport, Conn: Eno Foundation for Transportation, 1947.
MLA-viite (8. p.)Não informado. Traffic Quarterly. Eno Foundation for Transportation, 1947.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.