You are contributing to one of the most widely read resources on the web. Congrats! This will be a memorable experience. I'm glad to help you find the right resources as part of the process.
Go HERE to learn what Wikipedia prefers as reliable sources. Pay particular attention to the section on "Scholarship."
More from Wikipedia about what to look for in sources:
For this class, you will need to use Medical Reliable Sources (MEDRS) (source: Wikipedia)
Good sources (from Wikipedia training module):
Some good examples of MEDRS:
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