Published memoirs, letters, diaries, and collections of source documents can serve as primary sources, depending on your topic. Beyond these "first person accounts," books published at the time of your topic can reveal a great deal about the attitudes and assumptions of the time.
Try to add terms such as "sources," "personal narratives," "memoirs," or "correspondence" to your search terms to locate published sources.
Special Collections holds several valuable rare books related to Cherokee history and culture. The volumes compliment both the larger collection of Arkansas related books and archives, as well as the state and Northwest Arkansas region's long connection with the Cherokee Nation.