Verse-by-Verse Commentaries:

Carl E. Armerding, "Obadiah" in Expositor's Bible Commentary, Zondervan, 1985.
Ehud Ben Zvi, A Historical-Critical Study of the Book of Obadiah (Beihefte zur ZAW, No 242), Walter De Gruyter, 1996.
Jeffrey Niehaus, "Obadiah" in The Minor Prophets, Vol II, (ed. T. McComiskey), Baker, 1993.
Paul Raabe
, Obadiah (Anchor), Fortress, 1996.
Hans Walter Wolff, Obadiah and Jonah (Hermeneia), Augsburg-Fortress, 1986.

Monographs, Compilations, and Studies:

Articles and Essays:

Loren F. Bliese, "Chiastic and Homogeneous Metrical Structures Enhanced by Word Patterns in Obadiah,"
____ Journal of Translation and Textlinguistics 6 (1993): 210-227.

Elizabeth Achtemeier, Minor Prophets, Vol. I, Hosea-Micah (NIBC), Hendrickson, 1996.
Leslie C. Allen, The Books of Joel, Obadiah, Jonah, and Micah (NICOT), Eerdmans, 1976.
D. W. Baker, T. D. Alexander, and B. K. Waltke, Obadiah, Jonah, Micah (Tyndale), Inter Varsity, 1988.
James Limburg, Hosea-Micah (Interpretation), Westminster John Knox, 1988.
B. K. Smith and F. S. Page, Amos, Obadiah, Jonah (New American Commentary, 19b), Broadman and Holman, 1995.
Douglas Stuart, Hosea-Jonah (Word, 31), Word Books, 1987.