Sigafoos, R. A. (1955). The municipal income tax: Its history and problems. Public Administration Service.
Lua i Stíl Chicago (17ú heag.)Sigafoos, Robert Alan. The Municipal Income Tax: Its History and Problems. Chicago: Public Administration Service, 1955.
Lua MLA (9ú heag.)Sigafoos, Robert Alan. The Municipal Income Tax: Its History and Problems. Public Administration Service, 1955.
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