- "View of Ward 8, Cook County Hospital," in Prominent Physicians, Surgeons, and Medical Institutions of Cook County in the Closing Year of the Nineteenth Century: with Biographical Sketches (Chicago: Redheffer Art Publishing Co., [1899]), document p. 432.
Available from Internet Archive: https://archive.org/details/prominentphysici00unse/mode/2up
- "Marie J. Mergler, M.D," in Prominent Physicians, Surgeons, and Medical Institutions of Cook County in the Closing Year of the Nineteenth Century: with Biographical Sketches (Chicago: Redheffer Art Publishing Co., [1899]), document p. 256.
Available from Internet Archive: https://archive.org/details/prominentphysici00unse/mode/2up
- "Surgical Operation. Dr. Marie J. Mergler's Clinic. Woman's Hospital," in Prominent Physicians, Surgeons, and Medical Institutions of Cook County in the Closing Year of the Nineteenth Century: with Biographical Sketches (Chicago: Redheffer Art Publishing Co., [1899]), document p. 258.
Available from Internet Archive: https://archive.org/details/prominentphysici00unse/mode/2up
- Mergler, Marie J, "History of Competitive Examinations," in Woman's Medical School, Northwestern University: (Woman's Medical College of Chicago): the Institution and its Founders, Class Histories, 1870-1896 (Chicago: H.G. Cutler, 1896), 92.
Available from U.S. National Library of Medicine Digital Collections: http://resource.nlm.nih.gov/62810370R