When searching SC4 Library online using the OneSearch option, you'll see the box below on the upper left side of the search screen.
Underneath Refine Your Search, you can check the Scholarly & Peer Reviewed option or just the Peer-Reviewed option; both will return searches with academic-quality sources.
You'll also notice the section that says Content Type under Refine Your Search, and by checking Journal Article, Magazine Article, etc. you can further refine the results of your search.
Peer reviewed = Articles read & approved for publication by experts in the field
Experts = People with advanced degrees in the subject or who have worked in the field for many years