Protecting Birds from Striking Glass Windows, Bird-Friendly Buildings, Audubon Pennsylvania, https://pa.audubon.org/conservation/protecting-birds-striking-glass-windows

The Bird-Window Brochure, The Bird-window Collision Working. Group (BCWG), https://bridgerlandaudubon.org/wp-content/uploads/2021/04/pa.audubon.bird_.collision.brochure.with_.bas_.logo_.pdf

Making your Windows Safer for Birds, Menunkatuck Audubon Society, https://menunkatuck.org/bird-safe-windows

How to Keep Birds From Hitting Windows, American Bird Conservancy, https://abcbirds.org/glass-collisions/stop-birds-hitting-windows/

Messmer, Terry, Cowell, Samuel, Dietrich, Dietrich, and Sullivan, Kimberly, Ask an Expert: Seven Tips to Keep Birds from Hitting Your Windows, Utah State University Extension, March 28, 2017, https://extension.usu.edu/news_sections/agriculture_and_natural_resources/bird-windows

Cowell, Samuel, Dietrich, Dietrich, Sullivan, Kimberly and Messmer, Terry, Reducing the Risk of Birds Colliding into Windows:
A Practical Guide for Homes and Businesses [NR/Wildlife/2017-01pr], Utah State University Extension, March 2017, https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2682&context=extension_curall

Consumer Guide to Bird Window Strike Prevention, Bird Friendly Yards, https://birdfriendlyyards.net/consumerguide/