Common Backyard Birds — Backyard Bird Blog — Santa Clara Valley
Black-throated Blue Warbler Identification, All About Birds
Cornell Lab of Ornithology—Home Birds, Cornell Lab of Ornithology
Black-throated Gray Warbler Identification, All About Birds
Birds of the Sugarbush: Black-throated Blue Warbler
Bird Research – Hubbard Brook Field Ornithology Program
Black-throated Blue Warbler Identification, All About Birds
A Great Time to be a Birder - updated 5/14/21 - Friends of Wehr
Black-throated Blues
Wild Bird: Understanding Colorful Birds
Black-throated Blue Warbler Identification, All About Birds
Cornell Lab of Ornithology—Home Birds, Cornell Lab of Ornithology
All About Birds Southeast by Cornell Lab of Ornithology, Paperback
Plumages, Molts, and Structure - Black-throated Blue Warbler