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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pacific Northwest Research Station (Portland, Or.), Sally J. Campbell, L. H. Liegel, و Martha H. Brookes. Disturbance and Forest Health in Oregon and Washington. Portland, Or.: USDA Forest Service, Pacific Northwest Research Station, 1996.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Pacific Northwest Research Station (Portland, Or.), et al. Disturbance and Forest Health in Oregon and Washington. USDA Forest Service, Pacific Northwest Research Station, 1996.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.