Washington State Planning Council & United States. National Park Service. (1939). A study of parks, parkways and recreational areas, state of Washington.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington State Planning Council و United States. National Park Service. A Study of Parks, Parkways and Recreational Areas, State of Washington. [Olympia], 1939.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington State Planning Council و United States. National Park Service. A Study of Parks, Parkways and Recreational Areas, State of Washington. 1939.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.