APA (7th ed.) Citation

Gregori I, p. (1982). Registrum Episcolarum. Brepols.

Chicago Style (17th ed.) Citation

Gregori I, papa. Registrum Episcolarum. Turnhout: Brepols, 1982.

MLA (9th ed.) Citation

Gregori I, papa. Registrum Episcolarum. Brepols, 1982.

Warning: These citations may not always be 100% accurate.