Just and Unjust Wars
- Discussion of the differing views of brothers H. Richard and Reinhold Niebuhr expressed in a debate regarding war.
- http://www.ucc.org/beliefs/theology/two-famous-brothers-debate.html

Internet Archive - The Irony of American History
- Based on lectures critical of America's pretensions of virtue, power, and wisdom. Charles Scribner's Sons, 1952.
- http://www.archive.org/details/ironyoftheameric010135mbp/

Internet Archive - Reinhold Niebuhr: A Prophetic Voice in Our Time
- Tribute essays by Paul Tillich, John C. Bennett, and Hans J. Morgenthau with response by Niebuhr. Edited by Harold R. Landon, 1962.
- http://www.archive.org/details/reinholdniebuhra010466mbp/

Internet Archive - Reinhold Niebuhr: Prophet from America
- Biography by David Richard Davies.
- http://www.archive.org/details/reinholdniebuhrp00daviiala/

Internet Archive: Essays in Applied Christianity
- Collection of earlier essays by Niebuhr published in 1959.
- http://www.archive.org/details/essaysinappliedc027306mbp

Reinhold Niebuhr
- Biography from the Dictionary of Modern Western Theology.
- http://people.bu.edu/wwildman/WeirdWildWeb/courses/mwt/dictionary/mwt_themes_770_niebuhrreinhold.htm

Religion Online: Reinhold Niebuhr
- Six complete books and some shorter writings by the theologian, plus some evaluations of his work by others.
- http://www.religion-online.org/listbycategory.asp?Cat=37