Classic texts: Thomas 1907.
Classic texts: Ellingwood 1910.
Archives: Best of the Herbal Forums: 02.2003.
Classic texts: Eli Jones' Definite Medication, 1911.
Henriette's herbal blog: The aboveground parts of mullein are covered in itchy hairs.
Henriette's herbal blog.
Archives: Best of the Herbal Forums: 03.1995.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.