Here are a few criteria for determining if your source is scholarly:
Author(s) credentials - are they experts working or teaching in this field of study?
Length - is it a few brief paragraphs or a longer, more substantive article?
Language - is it written for other scholars in the field? Do they used specialized or technical language specific to this field of study?
References - is the author(s) citing other scholars in this field of study? Do they have a robust reference list?
Journal or Book Type - If it's a journal article, what kind of journal is the article is published in? Is it a scholarly journal, or even peer reviewed? If it’s a book, is it published by a university press or other well-respected commercial publisher known for publishing scholarly works?