Respuesta :
Answer:
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 of information that would be considered credible for a research paper. The study published by researchers is credible because it was written by experts and published in a reliable site. The book is reliable because books usually go through a lot of revisions in order to ensure they are ready to be published, regardless of the simplicity of the language they use. Finally, a book written by a scholar on the topic combines these two reasons, and is probably the most reliable source of information possible.