Galbreath, Donald Lindsay (13 September 1930). "A Treatise on Ecclesiastical Heraldry". W. Heffer and sons, Limited. Archived from the original on 10 March 2024. Retrieved 12 November 2020– via Google Books.
These criteria for statehood were first authoritatively enunciated at the Montevideo Convention on Rights and Duties of States, signed by American states on 26 December 1933. "Montevideo Convention". Encyclopedia Britannica.
"Holy See, The country brief". Department of Foreign Affairs and Trade (Government of Australia). Archived from the original on 20 February 2024. Retrieved 20 February 2024.
"Holy See, The country brief". Department of Foreign Affairs and Trade (Government of Australia). Archived from the original on 20 February 2024. Retrieved 20 February 2024.
Galbreath, Donald Lindsay (13 September 1930). "A Treatise on Ecclesiastical Heraldry". W. Heffer and sons, Limited. Archived from the original on 10 March 2024. Retrieved 12 November 2020– via Google Books.