PubMed
Library of Congress
Encyclopedia Britannica
Smithsonian Institution Library Catalog
Click on "Search Databases" option in the left sidebar and search for a database option.
Once the database option is selected, search for your topic within the database.
Select the article(s) within your search results you wish to retain. Once selected, the "folder" icon and the "import" feature will become active.
After the import is completed, your reference will appear in RefWorks.