Baton Rouge Audubon Society

The Birdhouse Network

Cornell's Bluebird-L Reference Guide (with Alpha codes)

Florida Bluebird Society

Indiana Bluebird Society

Maryland Bluebird Society

Michigan Bluebird Society

New York State Bluebird Society

North American Bluebird Society

Ohio Bluebird Society

Purple Martin Conservation Association

Sialis.org

Texas Bluebird Society

Toledo-Bend Gallery

Virginia Bluebird Society