Reference of commands shown at the lecture
IRAF homepage
IRAF UserSupport
The Zen of IRAF
Useful IRAF guides:
A beginners guide to using IRAF
http://iraf.noao.edu/iraf/ftp/iraf/docs/spect.ps.Z
http://iraf.noao.edu/iraf/ftp/iraf/docs/ccduser3.ps.Z
http://users.utu.fi/kani/spektriohje/index.html (In Finnish!)