What are the four main reasons why you should cite your sources?

Academic air. The first reason is not the most important one, but it is the most convincing one to most people: it heightens credibility.

Intellectual honesty. This is the most important reason: honesty.

Legal reasons & plagiarism.

Opinion leaders & experts.

You can word this better but

1. Avoid plagiarism

2. Give credit to the author

3. Let your readers be able to track down where you found it (info)

4. Show that you've done research and the information is accurate