Walt Wolfram discusses the Appalachian variety in North Carolina in an audio clip for North Carolina public radio, including features like [Published on 06-09-2014]
A 2013 Atlantic interview with Walt Woflram on dialects and politics.
A 2006 piece on NPR about Bill Clinton's use of a heavier Southern accent in a moment of anger, with guest Walt Wolfram, who explains the phenomenon of style-shifting.
Transcript of interview with Walt Wolfram in which many aspects of Southern English are discussed. Audio available on website.