Daniels, J. (1934). Coal in Washington: Distribution, geology, mining, preparation, uses, and economic value of coal resources of Washington. University of Washington.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Daniels, Joseph. Coal in Washington: Distribution, Geology, Mining, Preparation, Uses, and Economic Value of Coal Resources of Washington. Seattle: University of Washington, 1934.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Daniels, Joseph. Coal in Washington: Distribution, Geology, Mining, Preparation, Uses, and Economic Value of Coal Resources of Washington. University of Washington, 1934.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.