Blech, Benjamin; Doliner, Roy. (2008). The Sistene Secrets. New York, NY: HarperCollins Publishers. стр. 106. ISBN978-0-06-146904-6. The term 'terrible' was first applied by Julius himself to Michaelangelo, and only later to the Pope by others: Pastor 1902, VI, pp. 214–5.
„Pope Julius II”. Luminarium. Приступљено 18. 1. 2021.(језик: енглески)
newadvent.org
„Pope Julius II”. New Advent. Приступљено 18. 1. 2021.(језик: енглески)
Indulgences (which remit the temporal effects of sins that have already been forgiven) involve the person receiving the indulgence doing some sort of good work, like donating to a charitable cause. Kent, William. „Indulgences”. The Catholic Encyclopedia. New York: Robert Appleton Company. Приступљено 26. 5. 2020.CS1 одржавање: Формат датума (веза).