Guariguata, Manuel R.; Gilbert, Gregory S. (1996). "Interspecific Variation in Rates of Trunk Wound Closure in a Panamanian Lowland Forest". Biotropica. 28 (1): 23–29. doi:10.2307/2388768. ISSN0006-3606. JSTOR2388768.
"Tree pruning guide". US Forest Service for the US Department of Agriculture. Archived from the original on April 26, 2007. Features a diagram of the branch collar.
Guariguata, Manuel R.; Gilbert, Gregory S. (1996). "Interspecific Variation in Rates of Trunk Wound Closure in a Panamanian Lowland Forest". Biotropica. 28 (1): 23–29. doi:10.2307/2388768. ISSN0006-3606. JSTOR2388768.
"Tree pruning guide". US Forest Service for the US Department of Agriculture. Archived from the original on April 26, 2007. Features a diagram of the branch collar.
Guariguata, Manuel R.; Gilbert, Gregory S. (1996). "Interspecific Variation in Rates of Trunk Wound Closure in a Panamanian Lowland Forest". Biotropica. 28 (1): 23–29. doi:10.2307/2388768. ISSN0006-3606. JSTOR2388768.