Pacific Northwest Research Station (Portland, Or.), Campbell, S. J., Liegel, L. H., & Brookes, M. H. (1996). Disturbance and forest health in Oregon and Washington. USDA Forest Service, Pacific Northwest Research Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPacific Northwest Research Station (Portland, Or.), Sally J. Campbell, L. H. Liegel, और Martha H. Brookes. Disturbance and Forest Health in Oregon and Washington. Portland, Or.: USDA Forest Service, Pacific Northwest Research Station, 1996.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPacific Northwest Research Station (Portland, Or.), et al. Disturbance and Forest Health in Oregon and Washington. USDA Forest Service, Pacific Northwest Research Station, 1996.
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