United States. Bureau of Outdoor Recreation. (1966). Federal focal point in outdoor recreation. Superintendent of Documents, U.S. Govt. Print. Off.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Bureau of Outdoor Recreation. Federal Focal Point in Outdoor Recreation. [Washington: Superintendent of Documents, U.S. Govt. Print. Off, 1966.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United States. Bureau of Outdoor Recreation. Federal Focal Point in Outdoor Recreation. Superintendent of Documents, U.S. Govt. Print. Off, 1966.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.