PlantFiles Pictures: Sugarberry, Sugar Hackberry (Celtis laevigata) by frostweed
31 Trees That Grow Well in Tennessee
The Queen of Seaford: Tuesday's Tree- Hackberry and Sugarberry
Knobby bark distinguishes the sugarberry tree
Flatheaded Hackberry Borer (Agrilus macer): A Secondary Pest on Sugarberry Trees in the Southern United States
Celtis (hackberry)
How to identify different types of trees by their bark or leaves - Quora
Common Hackberry Missouri Department of Conservation
Sugar Hackberry : Tree Montgomery