Hollywood Undead. Billboard [online]. [cit. 2022-10-29]. Dostupné online. (anglicky)
hollywoodundead.com
site.hollywoodundead.com
HOLLYWOOD UNDEAD - Debut Album SWAN SONGS In Stores Now!. web.archive.org [online]. 2010-01-05 [cit. 2022-10-29]. Dostupné v archivu pořízeném z originálu dne 2010-01-05.
web.archive.org
HOLLYWOOD UNDEAD - Debut Album SWAN SONGS In Stores Now!. web.archive.org [online]. 2010-01-05 [cit. 2022-10-29]. Dostupné v archivu pořízeném z originálu dne 2010-01-05.