Etcheson, W. W. (1959). A statistical atlas of Washington counties: Physical, commercial, & industrial resources. Bureau of Business Research, College of Business Administration, University of Washington.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Etcheson, Warren Wade. A Statistical Atlas of Washington Counties: Physical, Commercial, & Industrial Resources. Seattle: Bureau of Business Research, College of Business Administration, University of Washington, 1959.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Etcheson, Warren Wade. A Statistical Atlas of Washington Counties: Physical, Commercial, & Industrial Resources. Bureau of Business Research, College of Business Administration, University of Washington, 1959.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.