Grayson, Katharine (May 19, 2010). "Carlson ups stake in Rezidor Hotel Group". Minneapolis/St. Paul Business Journal. American City Business Journals. Retrieved January 17, 2019.
Vomhof Jr., John; Hammerand, Jim (February 14, 2014). "Carlson launches two new hotel brands". Minneapolis/St. Paul Business Journal. American City Business Journals. Retrieved January 29, 2019.