Episode Source Material: 

• Best Places - Donut Data Set
• Home / Rankings / Top Donut Cities
• A Dozen Things You Didn't Know About Dunkin' | Dunkin'
• The Salvation Army USA Blog - The Salvation Army Celebrates National Donut Day!
• National Donut Day
• Doughnut Girls: The Women Who Fried Donuts and Dodged Bombs on the Front Lines of World War I - World War I Centennial.
• Donut Day History - The Salvation Army Metropolitan Division
• The Women Who Fried Donuts and Dodged Bombs on the Front Lines of WWI