Berman (1983). Law and revolution: the formation of the Western legal tradition. Cambridge, Mass. p. 199. ISBN0-674-51774-1. OCLC8827871.{{cite book}}: CS1 maint: location missing publisher (link)
Vasile, Mihai (2017). "Introduction". Orthodox canon law reference book. Brookline, Massachusetts: Holy Cross Orthodox Press. pp. 5–6. ISBN978-1-935317-45-6. OCLC856076162.