tomes go digital. The National Law Journal. February 2, 2004: P8. Shane Greenstein and Michelle Devereux, "The Crisis at Encyclopædia Britannica" (pdf) (页面存档备份,存于互联网档案馆)
ISBN 978-0-07-145428-5. OCLC 85841308. Halpern, Neil A.; Pastores, Stephen M.; Greenstein, Robert J. Critical care medicine in the United States 1985–2000: An analysis