The following sources were consulted in the preparation of the article “The story of how coffee became a daily American ritual.”
- The Coffee-House of the 17th and 18th Centuries
- Defiance of the Patriots: The Boston Tea Party and the Making of America
- Revised United States Army Regulations (1861)
- Guide to the Hills Bros. Coffee Company, Incorporated Records
- Coffee in an Instant
- “Cool Off With Coffee”: Promoting Iced Coffee in Mid-Century America
- Coffee Consumption Over the Last Century
- Starbucks Company Timeline