Quill Corp. v. North Dakota // Wikipedia, the free encyclopedia. URL: en.wikipedia.org/wiki/Quill_Corp._v._North_Dakota.
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Hearing before the Committee on Ways and Means (US House of Representatives), May 24, 2011. Serial № 112—12. How other countries have used tax reform to help their companies to compete in the global market and create jobs. URL: waysandmeans.house.gov.
