Washington (State). Department of Agriculture. (1989). Washington's centennial farms: Yesterday and today. Washington State Dept. of Agriculture.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington (State). Department of Agriculture. Washington's Centennial Farms: Yesterday and Today. Olympia, Wash. (406 General Administration Bldg., Olympia 98504-0641): Washington State Dept. of Agriculture, 1989.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington (State). Department of Agriculture. Washington's Centennial Farms: Yesterday and Today. Washington State Dept. of Agriculture, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.