Não informado. (2022). USDA Forest Service Research Note PNW. Pacific Northwest Forest and Range Experiment Station.
Citação do estilo Chicago (17ª ed.)Não informado. USDA Forest Service Research Note PNW. Portland, Ore: Pacific Northwest Forest and Range Experiment Station, 2022.
Citação MLA (8ª ed.)Não informado. USDA Forest Service Research Note PNW. Pacific Northwest Forest and Range Experiment Station, 2022.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.