Use the following websites to search for resources that you can use as citations in Wikipedia.
Search for articles in Open Access Journal Databases.
Wikimedia Commons is the image site for Wikipedia. If you want to upload a photograph to a Wikipedia page, you should upload it on Wikimedia Commons. Once you’ve uploaded, Wikimedia Commons will give you a file name that you can embed in a relevant Wikipedia article.
You may upload works that you created entirely yourself. This includes photos and videos of:
Commons can’t accept work created by or based on the work of others – including photographs of it. By default, you can’t upload someone else’s work. This includes material such as: