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