Não informado. (2022). USDA Forest Service Research Paper PSW. U.S. Forest Service.
Lua i Stíl Chicago (17ú heag.)Não informado. USDA Forest Service Research Paper PSW. Berkeley, Calif: U.S. Forest Service, 2022.
Lua MLA (8ú heag.)Não informado. USDA Forest Service Research Paper PSW. U.S. Forest Service, 2022.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.