Verse-by-Verse Commentaries:

Andrew A. Bonar, Commentary on Leviticus, Banner of Truth, 1966. ****
John E. Hartley, Leviticus (Word), Word Books, 1992.
Walter Kaiser Jr., "The Book of Leviticus" in New Interpreter's Bible, Abingdon, 1994.
George A. F. Knight, Leviticus (Daily Study Bible), Westminster John Knox, 1981. ***
Mark F. Rooker, Leviticus (New American Commentary, 3A), Broadman & Holman, 2000.
Gordon J. Wenham, Leviticus (NICOT), Eerdmans, 1994. ****

In Dutch: Jan Christiaan Weststrate, De Christus Gepredikt: Verklaring van het Boek Leviticus, De Groot Goudriaan, 1998.

Monographs, Compilations, and Studies:

Mary Douglas, Leviticus as Literature, Oxford University Press, 2000. ****
Frank H. Gorman, Divine Presence and Community, Eerdmans, 1998.
James B. Jordan, Covenant Sequence in Leviticus and Deuteronomy, Institute for Christian Economics, 1989.
Samuel Henry Kellogg, Studies in Leviticus: Tabernacle Worship and the Law of the Daily Life, Kregel, 1988.
Joseph A. Seiss, Gospel in Leviticus,
Lindsay & Blakiston, 1860; Kregel, 1981.
Wilfried Warning
, Literary Artistry in Leviticus (Biblical Interpretation Series, 35), Brill Academic, 1999. ****

Articles and Essays:

Mary Douglas, "Poetic Structure in Leviticus" in Pomegranates and Golden Bells (ed. D Wright, et al): 239-256.
Christopher R. Smith, "The Literary Structure of Leviticus," JSOT 70 (1996): 17-32.
Angel M. Rodriguez, "Leviticus 16: Its Literary Structure" Andrews University Seminary Studies 34 (1996): 269-286.
Jan Joosten, People and Land in the Holiness Code: An Exegetical Study of the Ideational Framework of the Law in Leviticus 17-26
____ (Supplements to Vetus Testamentum, 67), Brill Academic, 1996.

Optional Commentaries:

Oswald T. Allis, "Leviticus" in The New Bible Commentary, Eerdmans, 1967: 140-167.
Phillip J. Budd, Leviticus (New Century), Sheffield Academic, 1999.
Erhard S. Gerstenberger, Leviticus: A Commentary (OTL), Westminster John Knox, 1996.
Roland K. Harrison, Leviticus (Tyndale), Inter Varsity, 1980.
Baruch A. Levine, Leviticus: The Traditional Hebrew Text With the New JPS Translation (JPS Torah Commentary, 3),
____ Jewish Publication Society, 1996.
Jacob Milgrom, Leviticus: A New Translation With Introduction and Commentary (Anchor, 3), Doubleday, 1991-2001 (3 vols.)
Arie Noordtzij, Leviticus (Bible Student's Commentary), Zondervan, 1981.
Rolf Rendtorff, Leviticus, Neukirchener Verlag des Erziehungsvereins, 1985.
Samuel J. Schultz, Leviticus: God among His People, Moody, 1983.
Frank H. Gorman Jr., Divine Presence and Community: A Commentary on the Book of Leviticus (ITC), Eerdmans, 1998.

Optional Monographs:

Calum M. Carmichael, Law, Legend, and Incest in the Bible: Leviticus 18-20, Cornell University Press, 1997.
Lester L. Grabbe, Leviticus (Old Testament Guides Series), Sheffield Academic, 1993.
Rolf P. Knierim, Text & Concept in Leviticus 1, (Forschungen zum Alten Testament, 2
), J. C. B. Mohr, 1992.
John F. A. Sawyer, Reading Leviticus: A Conversation with Mary Douglas (JSOT Sup, 227), Sheffield Academic, 1996.