"As Previously Worked Pigeon Mail" Farm. Garden. Countryside. <https://img.farmforage.com/img/agro-2019/kak-ranshe-rabotala-golubinaya-pochta-3.jpg>
Kratz, Jessie. "Unsung heroes of World War I: the carrier pigeons" National Archives, January 8, 2018, <https://prologue.blogs.archives.gov/2018/01/08/unsung-heroes-of-world-war-i-the-carrier-pigeons/>
Macalaster, Elizabeth. "War Pigeons Winged Couriers in the U.S. Military, 1878-1957" Jefferson, North Carolina: Macfarland and Co, 2020
McLaughlin, Elizabeth. "Meet the hero carrier pigeon that saved US troops during WWI battel 100 years ago" ABC news. <https://abcnews.go.com/International/meet-hero-carrier-pigeon-saved-us-troops-wwi/story?id=58233076>
McLellan, David. "Ministry of Information First World War Official Collection" August 9, 1918, <https://www.iwm.org.uk/collections/item/object/205193140>