Source 1: This article was found in a journal published by the American Psychological Association. Because it’s printed in a peer-reviewed journal, it can be safe to assume that the article provides credible information. Moreover, the authors are professors in the Department of Human Development at Connecticut College, so they are experts in that field of research. Other studies and research papers have also cited this article.
Source 2: Mary Rombokas is an established expert who did a study of college-aged students to evaluate the impact of high school extracurricular activities on academic performance. Other studies and research papers have cited this source.
Source 3: This source has several features that add to its credibility: it’s a peer-reviewed study; it’s written by a well-known scholar in the field; it’s published in the established National Association of Secondary School Principals Bulletin; and it’s cited by several other studies and research papers.