Não informado. (1957). American road builder. American Road Builders Association.
Chicago-viite (17. p.)Não informado. American Road Builder. Washington: American Road Builders Association, 1957.
MLA-viite (8. p.)Não informado. American Road Builder. American Road Builders Association, 1957.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.