You can find journal articles through your professional organization, but here are some resources to find easily accessible articles for free online.
The Directory of Open Access Journals https://doaj.org
PlOS, An Open Access Journal https://plos.org
Selected Full Text Psychology Journals (Free Index): www.verywellmind.com
Writing a blog or resource and need to cite? Use this citation generator: https://www.scribbr.com/apa-citation-generator/#/