Gilman, Edward F., and Amanda Bisson. “Chapter 13 — Developing a Preventive Pruning Program in Your Community: Mature Trees: ENH 1063/EP316, 9/2007”. EDIS 2007, no. 20 (November 19, 2007). Accessed April 18, 2024. https://journals.flvc.org/edis/article/view/117005.