United States. General Accounting Office. (1999). Ecosystem planning: Northwest Forest and Interior Columbia River Basin plans demonstrate improvements in land-use planning : report to Congressional requesters. The Office.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. General Accounting Office. Ecosystem Planning: Northwest Forest and Interior Columbia River Basin Plans Demonstrate Improvements in Land-use Planning : Report to Congressional Requesters. Washington, D.C. (P.O. Box 37050, Washington, D.C. 20013): The Office, 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. General Accounting Office. Ecosystem Planning: Northwest Forest and Interior Columbia River Basin Plans Demonstrate Improvements in Land-use Planning : Report to Congressional Requesters. The Office, 1999.