APA (7th ed.) Citation

O'Connell, D., Louis IX, K. o. F., & Isabelle, Q. o. N. The instructions of Saint Louis: A critical text.

Chicago Style (17th ed.) Citation

O'Connell, David, King of France Louis IX, and Queen of Navarre Isabelle. The Instructions of Saint Louis: A Critical Text.

MLA (9th ed.) Citation

O'Connell, David, et al. The Instructions of Saint Louis: A Critical Text.