William Blair. FUSE Science Summaries - Piercing the Veil: FUSE Observes a Star Behind the Cygnus Loop Supernova Remnant [online]. [cit. 2016-08-22]. Dostupné online. (anglicky)
u-strasbg.fr
simbad.u-strasbg.fr
SIMBAD Astronomical Database: Results for NGC 6960 [online]. [cit. 2016-08-22]. Dostupné online. (anglicky)
web.archive.org
The NGC/IC Project: Results for NGC 6960 [online]. [cit. 2016-08-22]. Dostupné v archivu pořízeném dne 2009-05-28. (anglicky)