Russell KF, Liang Y, O'Gorman K, Johnson DW, Klassen TP (2011). Klassen, Terry P (Ed.). "Glucocorticoids for croup". Cochrane Database Syst Rev. 1 (1). ss. CD001955. doi:10.1002/14651858.CD001955.pub3. PMID21249651.KB1 bakım: Birden fazla ad: yazar listesi (link)
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etymonline.com
Online Etymological Dictionary, croup 30 Temmuz 2017 tarihinde Wayback Machine sitesinde arşivlendi.. Accessed 2010-09-13.
Russell KF, Liang Y, O'Gorman K, Johnson DW, Klassen TP (2011). Klassen, Terry P (Ed.). "Glucocorticoids for croup". Cochrane Database Syst Rev. 1 (1). ss. CD001955. doi:10.1002/14651858.CD001955.pub3. PMID21249651.KB1 bakım: Birden fazla ad: yazar listesi (link)
Port C (Nisan 2009). "Towards evidence based emergency medicine: best BETs from the Manchester Royal Infirmary. BET 4. Dose of dexamethasone in croup". Emerg Med J. 26 (4). ss. 291-2. doi:10.1136/emj.2009.072090. PMID19307398.
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Vorwerk C, Coats T (2010). Vorwerk, Christiane (Ed.). "Heliox for croup in children". Cochrane Database Syst Rev. 2 (2). ss. CD006822. doi:10.1002/14651858.CD006822.pub2. PMID20166089.