"Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines."
This is the database of the American Psychological Association. ASD does NOT have subscription access to this database, so for most articles you will only be able to access the abstract.
"MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH)."
NoodleTools is an online research management platform that helps you evaluate information, build accurate citations, archive source material, take notes, outline topics, and prepare to write. Sign in with Google.
"Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines."
"ResearchGate is a European commercial social networking site for scientists and researchers to share papers, ask and answer questions, and find collaborators." Many studies are available free by contacting the authors through ResearchGate.
This "database contains over 16 500 peer-reviewed open access journals covering all areas of science, technology, medicine, social sciences, arts and humanities."