APA (7th ed.) Citation

Humbert de Romans & Berthier, J. (1956). Opera de vita regulari. Marietti.

Chicago Style (17th ed.) Citation

Humbert de Romans and Joachim-Joseph Berthier. Opera De Vita Regulari. Torino: Marietti, 1956.

MLA (9th ed.) Citation

Humbert de Romans and Joachim-Joseph Berthier. Opera De Vita Regulari. Marietti, 1956.

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