Não informado. Monthly Economic Letter. First National City Bank of New York.
Chicago-viite (17. p.)Não informado. Monthly Economic Letter. New York: First National City Bank of New York.
MLA-viite (8. p.)Não informado. Monthly Economic Letter. First National City Bank of New York.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.