Urban, W. M. (1909). Valuation its nature and laws: An introduction to the general theory of value. Swan Sonnenschein.
Cita Chicago Style (17a ed.)Urban, Wilbur Marshal. Valuation Its Nature and Laws: An Introduction to the General Theory of Value. London: Swan Sonnenschein, 1909.
Cita MLA (8a ed.)Urban, Wilbur Marshal. Valuation Its Nature and Laws: An Introduction to the General Theory of Value. Swan Sonnenschein, 1909.
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