Não informado. (2022). USDA Forest Service Resource Bulletin PNW. Pacific Northwest Forest and Range Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. USDA Forest Service Resource Bulletin PNW. Portland, Ore: Pacific Northwest Forest and Range Experiment Station, 2022.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. USDA Forest Service Resource Bulletin PNW. Pacific Northwest Forest and Range Experiment Station, 2022.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.