A study by researchers published on a university website.
A book that gives information in simple language.
A book written by a scholar on the topic.
Explanation:
These are the sources that would provide credible information for a research paper. A study by researchers published on a university website is likely to be trustworthy because the university provides credibility to it. A book written in simple language can be a good source, as long as the authors are knowledgeable in the subject. Finally, a book written by a scholar is likely to have information that has been properly researched and is therefore reliable.
