https://www.pbs.org/wgbh/americanexperience/features/top-ten-faq/ The author of several books about the Amish and other Anabaptist groups, Donald B. Kraybill is a ...
Scholars define the Old Order Amish by two distinctive features: 1) the use of horse-and-buggy transportation, and 2) the use of Pennsylvania German dialect in church services and daily conversation.