ピードモント・トライアド
1 2 American FactFinder. U.S. Census Bureau. 2011年.
↑ From Greensboro, NC to Raleigh, NC. Yahoo! Driving Directions.
↑ OMB BULLETIN NO. 10-02: Update of Statistical Area Definitions and Guidance on Their Uses Archived 2012年3月16日, at the Wayback Machine.. Office of Management and Budget. 2009年12月1日. (PDFファイル)
↑ Welcome to the Piedmont Triad Region of NC! Piedmont Triad Regional Council.
↑ Piedmont Triad Map. Piedmont Triad Partnership.