Testament Songs, Albums, Reviews, Bio & More. AllMusic [online]. [cit. 2023-06-30]. Dostupné online. (anglicky)
noisecreep.com
RAMIREZ, Carlos RamirezCarlos. Testament's Chuck Billy Opens Up About His Native American Upbringing. Noisecreep [online]. 2012-01-12 [cit. 2023-06-30]. Dostupné online. (anglicky)
roadrunnerrecords.com
BLABBERMOUTH.NET - TESTAMENT Frontman Is Hoping To Record 'Really Brutal' New Album. web.archive.org [online]. 2011-06-06 [cit. 2023-06-30]. Dostupné v archivu pořízeném z originálu dne 2011-06-06.
BLABBERMOUTH.NET - TESTAMENT Singer Talks About Beating Cancer. web.archive.org [online]. 2011-06-06 [cit. 2023-06-30]. Dostupné v archivu pořízeném z originálu dne 2011-06-06.
web.archive.org
BLABBERMOUTH.NET - TESTAMENT Frontman Is Hoping To Record 'Really Brutal' New Album. web.archive.org [online]. 2011-06-06 [cit. 2023-06-30]. Dostupné v archivu pořízeném z originálu dne 2011-06-06.
BLABBERMOUTH.NET - TESTAMENT Singer Talks About Beating Cancer. web.archive.org [online]. 2011-06-06 [cit. 2023-06-30]. Dostupné v archivu pořízeném z originálu dne 2011-06-06.