Make sure to include the name of the country you are studying when you search.
History museums are a great source of information or national archives if your country have only collections.
If you find information from websites that are more questionable in nature, such as Wikipedia, try to trace their claim to the original source. Wikipedia often has references listed at the bottom of their articles and you can use that list to locate more reliable sources.
Below are some websites that might be of use to search for your topic:
