Ieorg Wier
- An article from an Oxford University Press Early Music journal about an early sixteenth-century crumhorn maker.
- http://em.oxfordjournals.org/cgi/content/citation/7/4/511

Microwave Theory of a Crumhorn
- A paper by Charlie Jackson from the Spring 1999 IEEE Microwave Theory and Techniques Society Newsletter.
- http://home.earthlink.net/~cornetto45/art/crum2.htm

The Crumhorn
- The history of the crumhorn with audio samples.
- http://www.music.iastate.edu/antiqua/crumhorn.htm

Crumhorn Home Page
- Information about the crumhorn, including listings of makers, sound files, bibliography and links.
- http://www.recorderhomepage.net/crumhorn.html

Crumhorn
- Created by the VirRen Team.
- http://www.twingroves.district96.k12.il.us/Renaissance/Town/Music/Crumhorn.html

Diabolus Guide to the Crumhorn and Rackett
- From the Diabolus in Musica Guide to Early Instruments.
- http://www.diabolus.org/guide/crumhorn.htm

Early Music in Schools: Crumhorn
- Short description including sound clips and large printable images.
- http://www.earlymusic.i12.com/general/prod_4.htm