1. Prioreschi P. A history of medicine. In: vol II: Greek Medicine, chapter five, "Hippocrates". 2nd ed. NE: Horatius Press; 1996. p. 201-205
2. Centers for Disease Control and Prevention. Klebsiella pneuminae in Healthcare Settings. Available at: http://www.cdc.gov/HAI/organisms/klebsiella/klebsiella.htm
3. Austrian R. The Gram stain and the etiology of lobar pneumonia, an historical note. Bacteriological Reviews. 1960;24(3):261-265
4. Rudan I, Tomaskovic L, Boschi-Pinto C, Campbell H, WHO Child Health Epidemiology Reference Group. Global estimate of the incidence of clinical pneumonia among children under five years of age. Bulletin of the World Health Organization. 2004;356:895-903
5. Musher D, Anna R, Thorner AR. Community-acquired pneumonia. The New England Journal of Medicine. 2014;371:1619-1628