Google & Google Scholar
5 Must-Have Google Search Tips for Students, from Common Sense Education
Search Education Source, from EBSCO, for articles.
Tip: Use TI Title to force key words into the title of your results.
To search across disciplines, try Google Scholar.
Brantly, A. (2014, May). Learning outside the classroom: Academics aren't the only way to learn at school. Phi Delta Kappan, 95(8), 74.
Taylor, E. W., Neill, A. C., & Banz, R. (2008). Teaching in situ: Nonformal museum education. The Canadian Journal for the Study of Adult Education, 21(1), 19-36.