1. The Talmud: Divrei Chayyim II, 52.
2. The Talmud: Gittin, 69b.
3. von Rosenstein NR. On the Cough of Children. The Diseases of Children and Their Remedies. The Classics of Medicine Library, Birmingham, Alabama: LB Adams, 1776;183–190.
4. Heberden W. Asthma. The History and Cure of Diseases. The Classics of Medicine Library, Birmingham, Alabama: LB Adams, 1802;62–69.
5. Osler W. Bronchial Asthma. The Principles and Practice of Medicine. The Classics of Medicine Library, Birmingham, Alabama: LB Adams, 1776;497–503.