American playwrights Volume 5 (1750-1920): Plays by William Gillette, Rosemary Cullen, Don B. Wilmeth. Cambridge, England: Cambridge University Press. 1983: 30
(英语). Conclave. New Advert. [2017-04-14]. (原始内容存档于2017-03-18) (英语). A cardinal may leave the conclave in case of sickness (certified under oath by a physician)