Sources should be collaborated by other sources.
Multiple sources of information, if they all seem to agree, make the information more reliable. Sometimes you have to acknowledge that there is no "truth", only the most current or defensible truth.
We see studies "proving" and "contradicting" other studies all the time in science. Often the studies that are being compared vary in important ways, which makes a direct comparison difficult. Other times the sample size is simply too small to give significant results that can be applied to another population.
What's at the bottom of the page?
Logo Quilts: If you see a lot of company logos like a quilt below the first screen, that makes a website suspicious. If the site is not supported by the listed organizations, the website may be part of a scam to increase rankings of participating businesses to increase their ranking in Google and other search engines.
AVOID web pages with no contact information, or that have not been updated recently.
Good Example: See our Signature below. It has the current year and contact information.
Look for About Us, Contacts, and Sitemap.
About Us, Contact Us and Sitemap are critical parts of a good website. The Sitemap is like a website's Table Of Contents. These elements may be located at the top of the page, or at the bottom in the signature area.
YouTube: The Importance of Investigating the Author