MLA
Co., Galvano-Faradic Manufacturing. Portable Electromagnetic Machine Used for Electrotherapy and Owned by Dr. Charles Cotton Harrold. 1870. Robert W. Woodruff Health Sciences Center. Library, Box 51. https://digital.library.emory.edu/purl/805fbg79m4-cor.
APA, 6th edition
Co., G.-F. M. (1870). Portable electromagnetic machine used for electrotherapy and owned by Dr. Charles Cotton Harrold (Box 51) [Medical equipment]. Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/805fbg79m4-cor.
Chicago
Co., Galvano-Faradic Manufacturing. “Portable Electromagnetic Machine Used for Electrotherapy and Owned by Dr. Charles Cotton Harrold.” Medical equipment. Health Sciences Center Library Artifact Collection, 1870. Box 51. Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/805fbg79m4-cor.