There is no tick box or button to enable Peer Review searching, however you can search for peer reviewed items using a search syntax.
To run a search for Peer reviewed articles add the following search to the end of your query:
PRAI=yes
For example:
(Health OR Well-being) AND PRAI=yes
Please note: this will only work for the Informit Collections (and new APAFT content) as these are the only databases that index articles to include the Peer Reviewed indicator
