Não informado. (1963). US Forest Service Research Paper PNW. U.S. Forest Service.
Cita Chicago Style (17a ed.)Não informado. US Forest Service Research Paper PNW. Portland, Ore: U.S. Forest Service, 1963.
Cita MLA (8a ed.)Não informado. US Forest Service Research Paper PNW. U.S. Forest Service, 1963.
Precaución: Estas citas no son 100% exactas.