Não informado. (2022). Tree Planters' Notes. U.S. Department of Agriculture, Forest Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Tree Planters' Notes. Washington: U.S. Department of Agriculture, Forest Service, 2022.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Tree Planters' Notes. U.S. Department of Agriculture, Forest Service, 2022.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.