Williams, J. W. (1912). Obstetrics, a text-book for the use of students and practitioners (3d enl. and rev. ed., with sixteen plates and six hundred and sixty-eight illustrations in the text.). D. Appleton and Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Williams, J. Whitridge. Obstetrics, a Text-book for the Use of Students and Practitioners. 3d enl. and rev. ed., with sixteen plates and six hundred and sixty-eight illustrations in the text. New York and London: D. Appleton and Company, 1912.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Williams, J. Whitridge. Obstetrics, a Text-book for the Use of Students and Practitioners. 3d enl. and rev. ed., with sixteen plates and six hundred and sixty-eight illustrations in the text. D. Appleton and Company, 1912.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.