Note: Bibliographies of Parker's works are available in the following studies:
John White Chadwick. Theodore Parker, a Biography. Boston and New York, Houghton Mifflin Co., 1900. Pp. xi-xx.
Charles W. Wendte, ed. Bibliography and Index to the Works of Theodore Parker. Boston, The Beacon Press, 1910. Pp. 11-50.
Henry Steele Commager. Theodore Parker, Yankee Crusader. Boston, Little, Brown, and Co., 1936. Pp. 311-331.
The Collected Works of Theodore Parker. 15 vols. Boston, The Beacon Press, 1907-1910. This is the standard edition.
Levi Blodgett Letter. The Previous Question. Boston, Weeks, Jordan, and Co., 1840. Reprinted in full in the Appendix to the present volume, to which all citations refer.
West Roxbury Sermons 1837-1848. Boston, The American Unitarian Association, 1902. These sermons are not included in The Collected Works.
A Critical and Historical Introduction to the Canonical Scriptures of the Old Testament. 2 vols. Boston, Charles C. Little and James Brown, 1843. This was based on Wilhelm Martin Leberecht De Wette, Lehrbuch der historisch-kritischen Einleitung in die kanonischen und apocryphischen Böcher des Alten Testementes