Books can serve as a solid foundation for a research paper and provide both an overview and depth to a topic. Use OneSearch, the library catalog, to locate books. OneSearch can be accessed on the main page of the library website - library.csus.edu
Use the advanced search search box and be sure to limit your search to Books (use the dropdown associated with Material Type:) to retrieve monographs in print and electronic format on topics related to Ancient Mesoamerica.
Many of the databases will only provide you with a citation. To retrieve the full text of an article from within most databases, use the Find It @SacState link, which can usually be found at the end of a database record summary.