E Alan Mackintosh (1917). A Highland Regiment, by E A Mackintosh, M.C., Lt. Seaforth Highlanders. John Lane, The Bodley Head. Online here and here
E Alan Mackintosh (1918). War, the Liberator, and Other Pieces by E A Mackintosh, M.C., Lt. Seaforth Highlanders (51st Division), With a Memoir.John Lane, The Bodley Head. Online here and here)
About Mackintosh:
Colin Campbell and Rosalind Green (2004). Can't Shoot a Man With a Cold. Lt. E. Alan Mackintosh M.C. 1893–1917. Poet of the Highland Division. Argyll Publishing. Amazon UK
Colin Campbell (2013). Engine of Destruction. The 51st (Highland) Division in the Great War. Argyll Publishing. Amazon UK