Phelps, E. M. (1909). Selected articles on the income tax: With special reference to graduation and exemption. H.W. Wilson Co..
Lua i Stíl Chicago (17ú heag.)Phelps, Edith M. Selected Articles on the Income Tax: With Special Reference to Graduation and Exemption. Minneapolis: H.W. Wilson Co., 1909.
Lua MLA (8ú heag.)Phelps, Edith M. Selected Articles on the Income Tax: With Special Reference to Graduation and Exemption. H.W. Wilson Co., 1909.
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