Blech, Benjamin; Doliner, Roy. (2008). The Sistene Secrets. New York, NY: HarperCollins Publishers. p. 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 harvnb error: no target: CITEREFPastor1902 (help).