Matson, David Lertis and K.C. Richardson, eds. One in Christ Jesus: Essays on Early Christianity and “All That Jazz,” in Honor of S. Scott Bartchy. Eugene: Wipf and Stock, 2014. 1625641745, 9781625641748.
This book has a number of articles that relate directly to Galatians which I have listed below. You can also read the first few on the publisher’s website.
Russell, A. Sue. “Galatians 3:28 beyond Status and Role: Living Anti-Structurally within Structure.” 1-19.
Stegemann, Wolfgang. “Hierachisierung und Relativierung multipler Identitäten in Galater 3:28.” 20-34.
Duling, Dennis C. “Social-Scientific Comments on ‘Neither Judean nor Greek’ (Gal 3:28).” 35-68.
Adewuya, J. Ayodeji. “Galatians 3:28 and the African Story.” 184-198.
Mason, Robert James. “Galatians 3:28: An Aspect of Eschatological Asceticism in Paul.” 222-239.
I didn’t notice the Concordia Commentary publishing of the commentary on Galatians by Andrew Das, 2014.
Your webiste looks like it well be a helpful list of books and articles needed for me to write a proposal on Gal 2:15-21. I look forward to searching further through your site.