Barbour, D. M. (1912). The standard of value. Macmillan.
Lua i Stíl Chicago (17ú heag.)Barbour, David M. The Standard of Value. London: Macmillan, 1912.
Lua MLA (8ú heag.)Barbour, David M. The Standard of Value. Macmillan, 1912.
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