I think my must read list would have to include more titles than that! 
I'd say read as many Vance Randolph titles as possible, Milton Rafferty, Leland and Crystal Payton, Brooks Blevins, Ernest Otto Rayburn, Ellen Gray Massey, throw in Donald Harrington, Ernie Deane, Lynn Morrow and Linda Myers Phinney, Robert K. Gilmore, Phyllis Rossiter, Larry Dabblemont, Tom Koob, Phillip Steele, and that just scratches the surface. Elmo Ingonthron did a great job with his trilogy, and many, many folk who wrote little booklets sold in tourist shops did a really good job of telling Ozark tales and stories, and bits of local history you won't find anywhere else...but be careful of the non-academic, touristy stuff, as some of it just plays on the hillbilly image and is partially or totally made up crap to sell to the vacationers. After you have read several sources, you will be able to determine most of the time what is the truth and what is made up.
That sounds very similar to what I tell my students, Junior. To place the Ozarks in the larger context of American history, I recommend Stephen Aron's
American Confluence, which is a history of the Missouri-Mississippi River "confluence region", and the unique mixture of Osage, Eastern Woodland Indians (Shawnee, Cherokee, etc.), French, Spanish, African and American cultures; cultural studies such as David Hackett Fisher's
Albion's Seed: Four British Folkways in North America, and in particular his chapter on the Northern British (Scotland, Northern England and Ulster); Leyburn's
The Scotch-Irish: a Social History, which is still the best one-volume history of the Scots-Irish/Ulster-Scots; McWhinney's
Cracker Culture, although I am wary of all of the late Dr. McWhinney's theory of "Southern=Celtic, Northern Teutonic" societies, and the collection of essays entitled The
Thistle and the Brier, which discusses the Scottish influences on Appalachia.
