On the Pew Research site, you can find a summary of the findings of how teen-age students do research today. Here is the summary of the sources they are likely to consult:

Google or other online search engine (94%)Wikipedia or other online encyclopedia (75%)YouTube or other social media sites (52%)Their peers (42%)Spark Notes, Cliff Notes, or other study guides (41%)News sites of major news organizations (25%)Print or electronic textbooks (18%)Online databases such as EBSCO, JSTOR, or Grolier (17%)A research librarian at their school or public library (16%)Printed books other than textbooks (12%)Student-oriented search engines such as Sweet Search (10%)

The heading under which these data are given reads: The internet has changed the very meaning of research. I would like myself to know how many of the teens consulted more than one of these.