Adolf von Harnack
- Three brief biographical articles from the Dictionary of Modern Western Theology.
- http://people.bu.edu/wwildman/WeirdWildWeb/courses/mwt/dictionary/mwt_themes_680_harnack.htm

Adolf Harnack - Wikipedia
- Article on the theologian, historian and essayist who was one of the major contributors to the theories of the social gospel movement.
- http://en.wikipedia.org/wiki/Adolf_Harnack

Harnack, Adolf: Outlines of the History of Dogma
- Evangelical criticism of Harnack's views regarding the Gospel of John and the Trinity.
- http://www.bible.ca/trinity/trinity-Harnack.htm

Marcion
- An excerpt from Adolf von Harnack's, "History of Dogma."
- http://www.webcom.com/~gnosis/library/marcion/Harnack.html