If you can't find enough CREDIBLE, RELIABLE sources for your paper, you should change your search strategy and start over.
It depends on the source. Sometimes on websites, the person or persons responsible are listed at the very bottom of the page; sometimes at the top under the title.
In books, the full list of author(s) and/or editors is on the title page.
In articles, it is usually listed at the beginning; or if found on a database, the author is listed in the citation of the article.
Always look for the responsible party. Then look at their credentials. If they don't have credentials listed, Google them.
Look at the source critically.