The autobiography of a woman soldier, a brief record of adventure with the Serbian army, 1916-1919, by Flora Sandes (captain, Serbian army) illustrated from photographs. (New York, Frederick A. Stokes company, [1927]) (page images at HathiTrust)
An English Woman-Sergeant in the Serbian Army (London, New York, Toronto: Hodder and Stoughton, ca. 1916) (multiple formats at archive.org)