Watch this video from WHMS Library to understand the difference between library databases and search engines.
In general, scholarly sources:
Articles published in scholarly journals which cover academic and scientific research. Scholarly journals are often referred to as "peer-reviewed" or "refereed" journals. Journals can also be scholarly or academic, but not have the extra level of quality control known as "peer review."
Books are not "peer-reviewed," like articles. Instead, they are written by academic scholars, and edited and published (most often) by academic or university presses, e.g.: Routledge, IGI Global, or Oregon State University Press. A book review can indicate if the book is scholarly.
*LibrarySearch includes search results from many of the UO Libraries database subscriptions.
Databases often have a "Scholarly" or "Peer Review" filter option too. Here's an example from one of our EBSCO databases:
Search in LibrarySearch by title or keyword. Many of our books are "scholarly," but look for the name of the publisher to find an academic press, e.g., "Princeton University Press."
Watch this video from Carteret Community College Library to understand the differences between databases.