• Anahuac NWR

• Houston Audubon Society

• Texas Bluebird Society

• Friends of Trinity River Refuge

• Trinity River National Wildlife Refuge

• Friends of Anahuac Refuge

• Birds of the Upper Texas Coast by David Sarkozi

• North American Bluebird Society

• Cornell Lab of Ornithology

• Birding Homer Alaska

• Frinds of Balcones Canyonlands National Wildlife Refuges

• TexBirds