The Book of Ruth (New International Commentary on the Old Testament (NICOT))
Esther and Ruth (Reformed Expository Commentary)
Judges, Ruth: An Exegetical and Theological Exposition of Holy Scripture (The New American Commentary)
From Famine to Fullness: The Gospel According to Ruth (The Gospel According to the Old Testament)
Ruth & Esther: Women of Faith, Bravery, and Hope (MacArthur Bible Studies)