Olevianus, Kaspar
- New Schaff-Herzog Encyclopedia of Religious Knowledge article on Olevianus and his work on the Heidelberg Catechism
- http://www.ccel.org/ccel/schaff/encyc08/Page_235.html

Heidelberg Catechism
- New Schaff-Herzog Encyclopedia of Religious Knowledge article on the history this catechism.
- http://www.ccel.org/ccel/schaff/encyc05/Page_204.html

The Life of Caspar Olevianus
- Biography of Olevianus.
- http://www.meetingpoint.org/jc/jc_eng/jcolev.htm

Caspar Olevianus (1536-1587)
- Short biography of this German reformer who helped write the Heidelberg Catechism.
- http://www.creeds.net/bios/olvns.htm