Wikipedia: Rudolf Hermann Lotze
- Entry from this openly-edited material, incorporating material from the 1911 Encyclopaedia Britannica.
- http://en.wikipedia.org/wiki/Rudolf_Hermann_Lotze

The Philosophy of Rudolph Hermann Lotze
- Digest of this 19th-century thinker's ideas, from the Radical Academy.
- http://radicalacademy.com/philrhlotze.htm

Biography.com: Lotze, Rudolf Hermann
- Concise biographical paragraph.
- http://search.biography.com/print_record.pl?id=9589

Lotze, Rudolf Hermann: The Columbia Encyclopedia
- Biographical entry on the philosopher R.H. Lotze
- http://www.bartleby.com/65/lo/Lotze-Ru.html

Rudolf Hermann Lotze
- Brief entry from the Internet Encyclopedia of Philosophy on this German thinker.
- http://www.utm.edu/research/iep/l/lotze.htm