REFERENCE WORKS: Generally, the category of works we call "reference" includes atlases, almanacs, bibliographies, dictionaries, directories, encyclopedias, guidebooks, handbooks, indexes, manuals, yearbooks—materials we "refer" to rather than read entirely. Go to these for definitions, topic overviews or background information. Reference librarians can help you find these.
A good place to start is the Texas Reference Center which includes articles from more than 80 journals and books about Texas and Texans. Topics include history, ethnic & cultural diversity, gender studies, literature, public health, business, home, garden, sports, and leisure.
Roger Griffin (1934 - 2016), professor of history at Austin Community College from 1973 until his retirement in 2001, compiled a detailed bibliography of Texas history primary source documents, given to the Texas State Historical Association when he retired.
His work, "Lone Star History Links," is available in the Texas State Historical Association's Handbook of Texas Online.