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.
Nixon said that he sold his apartment in New York when he became president in relation to the investigation conducted under his presidency. It is believe that eh gained profit from his public service. This is in defense to his record in the Watergate case.