Final answer:
Academic databases and journals are the best place to find quality academic sources for a senior thesis on special education.
Step-by-step explanation:
The best place to find quality academic sources for your senior thesis on special education would be academic databases and journals.
These databases contain peer-reviewed academic publications, which are considered the gold standard of research. They consist of textbooks, essays, journals, articles, reports, and scholarly books that provide strong evidence for an author's claims and undergo a rigorous peer review process.