Researchers who would like to dig deeper into the subjects touched upon in Hillbilly Music: Source and Symbol, should visit the Southern Folklife Collection either in person or on the web.
Reference sources for further study include those mentioned in the site, particularly:
Paul Kingsbury, ed. The Encyclopedia of Country Music. New York: Oxford University Press, 1998. The best all-around biographical resource, the Encyclopedia draws on both pioneers and contemporary artists' lives.
Guthrie T. Meade, Jr. Country Music Sources: A Biblio-Discography of Commercially Recorded Traditional Music. Chapel Hill: University of North Carolina Press, 2002. Meade's gift to American old-time music, an exhausive study of 14,500 recordings made between 1921 and 1942.The All Music Guide (www.allmusic.com). An indispensable resource, the All Music Guide provides biographical as well as discographical information, knowledgeable reviews, music maps, articles, and links to artists, genres, and styles in all areas of music.
Century of Country (www.countryworks.com) contains helpful information on many country artists that may not be found elsewhere.
Internet Archive (www.archive.org) is a large repository of "open" sources that can be used freely for non-commercial purposes. The site's audio section contains many .mp3 files taken from old-time music 78 r.p.m. recordings. Along with these recordings is often helpful information about the artists who recorded them.