1. Angel, J., C. Swanston, B. M. Boustead, K. C. Conlon, K. R. Hall, J. L. Jorns, K. E. Kunkel, et al. 2018. Midwest. In Impacts, Risks, and Adaptation in the United States: Fourth National Climate Assessment, Volume II, edited by D. R. Reidmiller, C. W. Avery, D. R. Easterling, K. E. Kunkel, K. L. M. Lewis, T. K. Maycock, and B. C. Stewart, 872–940. Washington: U.S. Global Change Research Program.
2. Barrett, R. 2018. Amish Dairy Farmers at Risk of Losing Their Living and Way of Life as Their Buyer Drops Their Milk. Milwaukee Journal Sentinel, 21 December. https://www.jsonline.com/story/money/2018/12/21/amish-dairy-farmers-risk-losing-their-living/2378827002/.
3. Burdge Jr., E. 2 February 2016. WI Amish Settlements with Affiliations. Unpublished tabulation, Young Center for Anabaptist and Pietist Studies, Elizabethtown College, Pennsylvania.
4. Cobb, K. 2006. Color Them Plain but Successful: Growing Hutterite Colonies Find Successful—and Sizable—Riches in District Economy. Federal Reserve Bank of Minneapolis. https://www.minneapolisfed.org/article/2006/color-them-plain-but-successful.