For a number of open access textbooks, go to Pressbooks Directory and use FIND A BOOK search for information literacy or media literacy or fake news or disinformation, etc.
Caulfield, Mike. Web Literacy for Student Fact-Checkers
Checkology. "Checkology is a free e-learning platform with engaging, authoritative lessons on subjects like news media bias, misinformation, conspiratorial thinking and more" (Not a textbook :) )
George Mason University. Climate Change Communication. Debunking Handbook 2020 This handbook summarizes the current state of the science of misinformation and its debunking.
Maid, Barry. Information Literacy: Research and Collaboration across the Disciplines. WAC Clearninghouse. 2016
McIntyre, Lee. Post-truth. MIT Press 2018 (open access)
The Media Manipulation Casebook. A collection of fact-checked, footnoted case studies from the Technology and Social Change project at the Shorenstein Center on Media, Politics and Public Policy.
University of Lousiville. University Libraries. Citizen Literacy. An online toolkit Incudes AI literacy, algorithmic literacy, informed voting, etc.
Viswanth, K., Taylor, T. E., & Rhodes, H. G. eds. (2025). Understanding and addressing misinformation about science. National Academies Press. [Download free PDF, read online for free, or purchase the paperback] (Another "not a textbook" - but open access).