Não informado. (2022). USDA Forest Service Research Paper PSW. U.S. Forest Service.
Chicago-viite (17. p.)Não informado. USDA Forest Service Research Paper PSW. Berkeley, Calif: U.S. Forest Service, 2022.
MLA-viite (8. p.)Não informado. USDA Forest Service Research Paper PSW. U.S. Forest Service, 2022.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.