MLA

Flaatten, Hans, Bertrand Guidet, and Hélène Vallet. Very Old Critically Ill Patients. Cham: Springer International Publishing AG, 2022.

APA

Flaatten, H., Guidet, B., & Vallet, H. (2022). Very Old Critically Ill Patients. Cham: Springer International Publishing AG.

Chicago

Flaatten, Hans., Bertrand Guidet, and Hélène Vallet. Very Old Critically Ill Patients. Cham: Springer International Publishing AG, 2022.