Não informado. (1939). Light metals bulletin. British Aluminium Company, Intelligence Department.
Chicago-viite (17. p.)Não informado. Light Metals Bulletin. London: British Aluminium Company, Intelligence Department, 1939.
MLA-viite (8. p.)Não informado. Light Metals Bulletin. British Aluminium Company, Intelligence Department, 1939.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.