Resistance to Boundaries with Kimberly Glaindo, LPC-S and Charissa Lopez, LPC-S.
Christian:
Boundaries by Dr. Henry Cloud and Dr. John Townsend
https://www.boundaries.me/ course by Dr. Cloud for content, coaching and community
Secular:
The Language of Letting Go: Daily Meditations on Codependency by Melody Beattie
Codependent No More by Melody Beattie
Set Boundaries Find Peace by Nedra Tawwab
https://www.raquelmartinphd.com/ Mental Health Resources by Dr. Raquel Martin