Butterfly Guide Books
- Handbook of Butterfly Watching – Robert Michael Pyle
- Basic Techniques for Observing and Studying Moths and Butterflies (PDF) – William D. Winter Jr.
- Butterflies of the East Coast: An Observer’s Guide – Rick Cech and Guy Tudor
- Swift Guide to Butterflies of North America, 2nd Edition – Jeffrey Glassberg
- Butterflies of North America – Kaufman Focus Guides – Jim Brock and Kenn Kaufman
- Butterflies through Binoculars: The East – Jeffrey Glassberg
- Caterpillars of Eastern North America – David L. Wagner
- Skipper Tops (PDF) – Sharon Wander
Butterfly Identification Web Sites
- Wisconsin Butterflies (very helpful for here too!)
- Butterflies of Massachusetts
- BugGuide – Butterflies
- Skippers of the Northeast video series – Dick Walton
Butterfly Atlases
- e-Butterfly
- Connecticut Butterfly Atlas
- Massachusetts Butterfly Atlas
- Maine Butterfly Survey
- Maritimes Butterfly Atlas
- Ontario Butterfly Atlas
