Friedensburg, F., & Gray, L. H. (1911). The practical results of workingmen's insurance in Germany. The Workmen's compensation service and information bureau].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Friedensburg, F., و Louis H. Gray. The Practical Results of Workingmen's Insurance in Germany. [New York city: The Workmen's compensation service and information bureau], 1911.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Friedensburg, F., و Louis H. Gray. The Practical Results of Workingmen's Insurance in Germany. The Workmen's compensation service and information bureau], 1911.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.