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etymonline.com
Online Etymological Dictionary, croup. 13. rujna 2010.
Russell KF, Liang Y, O'Gorman K, Johnson DW, Klassen TP. 2011. Klassen, Terry P (ur.). Glucocorticoids for croup. Cochrane Database Syst Rev. 1 (1): str. CD001955. doi:10.1002/14651858.CD001955.pub3. PMID21249651CS1 održavanje: više imena: authors list (link)
Port C. Travanj 2009. Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. BET 4. Dose of dexamethasone in croup. Emerg Med J. svezak 26. (broj 4): str. 291.–292. doi:10.1136/emj.2009.072090. PMID19307398