The Amish population statistics are updated annually in the summer. Other information is updated periodically.
For more in-depth discussion about the Amish:
Authors: Donald Kraybill, Karen Johnson-Weiner, and Steven Nolt (Johns Hopkins University Press, 2013; paperback, 2018)
In partnership with the Johns Hopkins University Press, the Young Center Books in Anabaptist and Pietist Studies publishes innovative and creative scholarship. The latest volume in the series explores the Amish relationship with the environment:
Authors: David McConnell and Marilyn Loveless (Johns Hopkins University Press, 2018)