APA (7th ed.) Citation

Guerricus Igny, A., Morson, J., Costello, H., & Deseille, P. Sermons. Ed. du Cerf.

Chicago Style (17th ed.) Citation

Guerricus Igny, Abt, John Morson, Hilary Costello, and Placide Deseille. Sermons. Paris: Ed. du Cerf.

MLA (9th ed.) Citation

Guerricus Igny, Abt, et al. Sermons. Ed. du Cerf.