[This bibliography contains only the more helpful commentaries on Proverbs and ones with which I am personally familiar. I have placed an * after those books that I would recommend you purchase.]
Alden, Robert L. Proverbs: A Commentary on an Ancient Book of Timeless Advice. Grand Rapids: Baker Book House, 1983.
Bridges, Charles. A Commentary on Proverbs. Carlisle: Banner of Truth Trust, 1981 . *
Garrett, Duane A. Proverbs, Ecclesiastes, Song of Songs. The New American Commentary. Nashville: Broadman Press, 1993. *
Mouser, William E. Walking in Wisdom: Studying the Proverbs of Solomon. Downers Grove: IVP, 1983. *
Ross, Allen P. Proverbs. The Expositor's Bible Commentary. Vol. 5. Grand Rapids: Zondervan, 1991. *
Survey Works on the Poetic/Wisdom Books
Aside from the many commentaries on the individual OT books, there are six introductions to the poetic/wisdom literature that are worthy of note:
Berry, Donald K. An Introduction to Wisdom and Poetry of the Old Testament. Nashville: Broadman & Holman Publishers, 1995.
Bullock, C. Hassell. An Introduction to the Old Testament Poetic Books. Chicago: Moody Press, 1988 . *
Bullock, C. Hassell. Encountering the Book of Psalms. Grand Rapids: Baker Academic, 2001. **
Crenshaw, J. L. Old Testament Wisdom: An Introduction. Atlanta: John Knox Press, 1981.
Kidner, Derek. The Wisdom of Proverbs, Job & Ecclesiastes. Downers Grove: IVP, 1985. *
Murphy, Roland E. The Tree of Life: An Exploration of Biblical Wisdom Literature. Grand Rapids: Wm. B. Eerdmans Publishing Co., 1996 .