Cohen, Norm (2005): . Greenwood Publishing Group. ISBN 978-0-313-32872-5. OCLC 145510879. Donaldson, Rachel Clare (2014): , Philadelphia: Temple University Press Lornell, Kip (2012): , Jackson: University Press of Mississippi. Nettl, Bruno (1. februar 1976): . Wayne State University Press. ISBN 978-0-8143-3757-8. OCLC 1018058006. Ritchie, Fiona; Orr, Doug (2014): , University of North Carolina Press. Forord av Dolly Parton og CD med 20 låter.