University of Groningen
American History: Biographies: The Story of Ethan Allen (1738 1789)
From the University of Groningen's American history project, this page provides a detailed biography of Ethan Allen (1738-1789) complete with bibliography.
Other
The Ethan Allen Homestead & Museum
This site is a great resource for information about Ethan Allen from the historical society that maintains his homestead.