There are several sources where you can find white papers, including:
Research journals and publications - Many academic research journals and publications feature white papers that are written by experts in a particular field. These papers are often available online and can be downloaded for free or for a fee.
Industry associations and trade organizations - Many industry associations and trade organizations publish white papers on topics related to their specific industry or sector. These papers can provide valuable insights and information for professionals and researchers in that field.
Company websites and blogs - Many companies publish white papers on their websites or blogs to showcase their expertise or provide insights on a particular topic related to their products or services.
Government agencies and non-profit organizations - Government agencies and non-profit organizations often publish white papers on policy issues, social issues, or other topics related to their mission or mandate.
White paper directories - There are several directories and repositories of white papers available online, which can provide a wealth of information on a wide range of topics.
Some popular sources of white papers include IEEE, ACM, arXiv, SSRN, ResearchGate, and Semantic Scholar. It's always a good idea to carefully evaluate the source and quality of the white paper before using it as a reference or source of information.