Aho, P. E. (1971). Decay of engelmann spruce in the Blue Mountains of Oregon and Washington. Pacific Northwest Forest and Range Experiment Station, USDA Forest Service.
Chicago-Zitierstil (17. Ausg.)Aho, Paul E. Decay of Engelmann Spruce in the Blue Mountains of Oregon and Washington. Portland, Or: Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, 1971.
MLA-Zitierstil (9. Ausg.)Aho, Paul E. Decay of Engelmann Spruce in the Blue Mountains of Oregon and Washington. Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.