(๑) Berg, Scott M. (2010). "In the Shadow of Joesphinism: Austria and the Catholic Church in the Restoration, 1815-1848". Louisiana State University Master's Thesis.
(๒) Blanning, Tim (2012). "The Holy Roman Empire of the German Nation past and present". Historical Research. 85 (227): 57–70. doi:10.1111/j.1468-2281.2011.00579.x.
(๓) Gagliardo, John G. (1980). Reich and Nation: The Holy Roman Empire as Idea and Reality, 1763–1806. Indiana University Press. ISBN 978-0253167736.
(๔) Renna, Thomas (2017). "Papal Approval of Holy Roman Emperors, 1250–1356". Expositions. 11 (2): 57–90.
(๕) Watson, Alexander (2014). Ring of Steel: Germany and Austria-Hungary in World War I. Basic Books. ISBN 978-0465018727.
(๖) Wilson, Peter H. (2009). "The Meaning of Empire in Central Europe around 1800". In Forrest, Alan; Wilson, Peter H. (eds.). The Bee and the Eagle: Napoleonic France and the End of the Holy Roman Empire, 1806. Palgrave Macmillan. ISBN 978-0-230-00893-9.
(๗) Treaty of Constantinople (1533)". Project Gutenberg Self-Publishing. May 11, 2021.