Kelley, J. H.. "Letter from J.H. Kelley, Pinkerton's National Detective Agency to Gordon A. Johnstone." Georgia Institute of Technology. Library. Archives, Records Management and Digital Curation Department . 1914-08-28, https://exhibit-archive.library.gatech.edu/fulton_bag/itemb105.html?collection=ms004&filename=ms004-041.xml.

Kelley, J. H. (1914-08-28). Letter from J.H. Kelley, Pinkerton's National Detective Agency to Gordon A. Johnstone. Retrieved from https://exhibit-archive.library.gatech.edu/fulton_bag/itemb105.html?collection=ms004&filename=ms004-041.xml

Kelley, J. H.. "Letter from J.H. Kelley, Pinkerton's National Detective Agency to Gordon A. Johnstone." 1914-08-28. June 20, 2025. https://exhibit-archive.library.gatech.edu/fulton_bag/itemb105.html?collection=ms004&filename=ms004-041.xml.