Não informado. (2022). Tree Planters' Notes. U.S. Department of Agriculture, Forest Service.
Chicago-referens (17:e uppl.)Não informado. Tree Planters' Notes. Washington: U.S. Department of Agriculture, Forest Service, 2022.
MLA-referens (8:e uppl.)Não informado. Tree Planters' Notes. U.S. Department of Agriculture, Forest Service, 2022.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.