Biography.com: Lotze, Rudolf Hermann: Concise biographical paragraph.
Lotze, Rudolf Hermann: The Columbia Encyclopedia: Biographical entry on the philosopher R.H. Lotze
Rudolf Hermann Lotze: Brief entry from the Internet Encyclopedia of Philosophy on this German thinker.
The Philosophy of Rudolph Hermann Lotze: Digest of this 19th-century thinker's ideas, from the Radical Academy.
Wikipedia: Rudolf Hermann Lotze: Entry from this openly-edited material, incorporating material from the 1911 Encyclopaedia Britannica.