This primary source comes from the Records of the War Department General and Special Staffs, 1860 - 1952.
Full Citation: Photograph 165-WW-265B-14; Medical Department - Restoration Work - Education and Rehab - Soldier patients learning to knit at Walter Reed General Hospital, Washington, DC; Medical Department - Restoration Work - Education and Rehab; American Unofficial Collection of World War I Photographs, 1917 - 1918; Records of the War Department General and Special Staffs, 1860 - 1952, Record Group 165; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/soldier-patients-learning-knit-walter-reed-general-hospital-washington-dc, May 9, 2024]