I see your example: Lewis, T.J., & Sugai, G. (1999). Effective behavior support: A systems approach to proactive school-wide management. Focus on Exceptional Children, 31(6), 1-24.
- Search OneSearch to see if we have it online or if a professor has put it on course reserve - usually the first few words of the title and the first author's last name are sufficient
- Google it to see if it is available through an online source, for free, like a government database or a college/university's scholarly repository
- If you have a DOI (Digital Object Identifier) Number you can search by the number in Google Scholar
Please contact the Library if you are having difficulty retrieving a particular article.