APA (7th ed.) Citation

Humbert de Romans & Berthier, J. (1888). De vita regulari. [s.n.].

Chicago Style (17th ed.) Citation

Humbert de Romans and Joachim-Joseph Berthier. De Vita Regulari. Romae: [s.n.], 1888.

MLA (9th ed.) Citation

Humbert de Romans and Joachim-Joseph Berthier. De Vita Regulari. [s.n.], 1888.