The Birder’s Library: Bird Apps of the World – A List of All Field Guide Apps for Apple and Android Devices

Audubon: What Bird Guide Is Best For You?  May 12, 2015

Audubon: Birding the United States: A state-by-state guide to the best birding hotspots around the country.  July 21, 2016

Boucher’s Birding Blog:: Apps for the Smart Birder — Which One Should You Use? March 21, 2016