APA (7th ed.) Citation

Catherine, o. G. (1880). The treatise on purgatory (3d ed.). Burns & Oates, Catholic Publication Society.

Chicago Style (17th ed.) Citation

Catherine, of Genoa. The Treatise on Purgatory. 3d ed. London, New York: Burns & Oates, Catholic Publication Society, 1880.

MLA (8th ed.) Citation

Catherine, of Genoa. The Treatise on Purgatory. 3d ed. Burns & Oates, Catholic Publication Society, 1880.