With all databases be sure you are reading the full-text article not just the abstract. When available use the limiters on the left to limit for peer-reviewed, date ranges or types of resources. Most databases have citations generated for you that may need minor tweaking.
Badgerlink High School level resources
Badgerlink access directions from home
Library of Congress - Archive of US documents. It has an ineffective search feature. The resources are there but found more easily by searching for your subject and adding AND loc.gov.
PLOS One - Public Library of Science
DOAJ - Directory of Open Access Journals
OMICS International - Scholarly and peer-reviewed articles and books
To access NoodleTools:
NoodleTools Tutorials