APA
George B. Ronald, .Essentials of Pulmonary and Critcal Care Medicine. United States of America: .
Chicago
George B. Ronald, .Essentials of Pulmonary and Critcal Care Medicine. United States of America: .
Harvard
George B. Ronald, .Essentials of Pulmonary and Critcal Care Medicine. United States of America: .
MLA
George B. Ronald, .United States of America: . .