Renz, Thomas. The Books of Nahum, Habakkuk, and Zephaniah. The New International Commentary on the Old Testament. Grand Rapids, MI: Eerdmans, 2021.
I found Renz especially insightful regarding the structure of the book and intertextual references, especially within the minor prophets.
Timmer, Daniel C. Nahum. Zondervan Exegetical Commentary on the Old Testament. Grand Rapids: Zondervan, 2017.
Timmer was also helpful on the structure of the book. Though his other work, Judah among the Empires, I a obtained a sense of his understanding of the role of the book as a whole, and I found his comments valuable.
Armerding, Carl. “Nahum.” The Expositor’s Bible Commentary. Revised Edition. Grand Rapids, MI: Zondervan, 2008.
Armerding’s observations of the links between Nahum and Isaiah was especially helpful.
Robertson, O. Palmer. The Books of Nahum, Habakkuk, and Zephaniah. New International Commentary on the Old Testament. 1990.
O. Palmer Robertson, as always, was theologically insightful.
Baker, David W. Nahum, Habakkuk and Zephaniah: An Introduction and Commentary. Tyndale Old Testament Commentaries. Downers Grove, IL: InterVarsity Press, 1988.
In the brief time I had for this study, I found Baker useful even as I used the above resources more.