John Goodrich, “Guardians not Taskmasters: The Cultural Resonances of Paul’s Metaphor in Gal 4.1-2,” JSNT 32 (2010) 251-84.
Mark Gignilliat, “Paul, Allegory and the Plain Sense of Scripture: Galatians 4:21-31,” Journal of Theological Interpretation 2 (2008) 135-46.
Chapter, Verse, and Season: A Lectionary Podcast, Ep34