Limit searches in Google by selecting a Reading Level. 1) Enter the search, to see and click on 2) Search tools. 3) Then select Reading level for a breakdown by percentage of the reading level.
Results look like this:
The results from Advanced reading level sites will be from sites which are more scholarly
You can limit your search results to specific domains, for instance, to .edu, .gov, .org, etc. Enter your search, followed by site:.domain (site colon dot domain, no spaces) (.edu, .gov, .org, etc.). Be aware that Wikipedia is a .org site and is not considered suitable for academic papers. For a printable handout on searching by domain name, click here.
You can also search within a site. For example:
Limit searches by time. 1)Enter the search in order to see and click on 2)Search tools, then on 3)Any time to pick a time. 4)Custom range allows you to select a date range.