Ballou, B. (1931). Historical map of the state of Washington. Published and copyrighted by the American Association of University Women, Spokane Branch.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ballou, Bertha. Historical Map of the State of Washington. [Spokane, Wash.?]: Published and copyrighted by the American Association of University Women, Spokane Branch, 1931.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ballou, Bertha. Historical Map of the State of Washington. Published and copyrighted by the American Association of University Women, Spokane Branch, 1931.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.