What should source material for research should be selected based on what?

Source material for research should be selected based on credibility, relevance, and accuracy. It's important to consider the author's qualifications, the publication's reputation, and the date of publication to ensure the information is current. Additionally, the source should align with the research objectives and provide valuable insights or data that enhance understanding of the topic. Evaluating sources for bias and objectivity is also crucial to maintain the integrity of the research.