Sheldon G. Cohen (). „Asthma among the famous. Daniel Webster (1782-1852), American lawyer, U.S. Senator, and statesman”. Allergy and Asthma Proceedings. 17 (6): 373–376. PMID9091245. WikidataQ36852537.|access-date= necesită |url= (ajutor)
Sheldon G. Cohen (). „Asthma among the famous. Daniel Webster (1782-1852), American lawyer, U.S. Senator, and statesman”. Allergy and Asthma Proceedings. 17 (6): 373–376. PMID9091245. WikidataQ36852537.|access-date= necesită |url= (ajutor)