Não informado. (1963). US Forest Service Research Paper PNW. U.S. Forest Service.
Style de citation Chicago (17e éd.)Não informado. US Forest Service Research Paper PNW. Portland, Ore: U.S. Forest Service, 1963.
Style de citation MLA (8e éd.)Não informado. US Forest Service Research Paper PNW. U.S. Forest Service, 1963.
Attention : ces citations peuvent ne pas être correctes à 100%.