Verse-by-Verse Commentaries:

Gregory K. Beale, Colossians and Philemon (BECNT), forthcoming.
E. Earle Ellis, "Colossians"
in The Wycliffe Bible Commentary, The Southwestern Company, 1968: 1333-1346.
James D. G. Dunn, The Epistles to the Colossians and to Philemon, (NIGTC), Eerdmans, 1996.
Andrew T. Lincoln, "The Letter to the Colossians" in
The New Interpreter's Bible, vol. XI, Abingdon, 2000: 551-670.
C. F. D. Moule, Epistles of Paul the Apostle to the Colossians and to Philemon, Cambridge Univ. Press, 1957.
Peter O'Brien, Colossians and Philemon (Word), Word Books, 1982. ****

Monographs, Compilations, and Studies:

Clinton E. Arnold, The Colossian Syncretism: The Interface between Christianity and Folk Belief at Colossae, Baker, 1996.
Thomas J. Sappington, Revelation and Redemption at Colossae (JSNT Supplement, 53), Sheffield Academic Press, 1991.

Articles and Essays:

Steven M. Baugh, "The Poetic Form of Col 1:15-20," WTJ 47 (1985): 227-244.
________ "Firstborn Over All: Colosians 1:15-20," Kerux 1.3 (Dec 1986).
William D. Dennison, "Resurrection Living: Colossians 3.1-4," Kerux 9.1 (May 1994).
Robert Drake, "The Conquest of the Cross: Colossians 2:15," Kerux 1.1 (May 1986).
Larry R. Helyer, "Colossians 1:15-20: Pre-Pauline or Pauline?" JETS 26 (1983): 167-179.
David L. Roth, "The Old Man: Colosians 3:1-18," Kerux 6.3 (Dec 1991).

More Commentaries:

Eduard Lohse, Colossians and Philemon (Hermeneia), Fortress, 1971.
Peter Pokorný,
Colossians: A Commentary, Hendrickson, 1991.
N. T. Wright, The Epistles of Paul to the Colossians and to Philemon (Tyndale), IVP, 1988.

More Articles:

Gregory T. Christopher, "A Discourse Analysis of Colossians 2:16-3:17," Grace Theological Journal 11 (1990): 205-220.