Winrow, Andrew (2009). "Defender of the Realm: The Life and Work of Lieutenant Colonel Adrian Grant Duff, 1869-1914". Journal of the Society for Army Historical Research. 87: 300. JSTOR44231708.
Winrow, Andrew (2009). "Defender of the Realm: The Life and Work of Lieutenant Colonel Adrian Grant Duff, 1869-1914". Journal of the Society for Army Historical Research. 87: 304. JSTOR44231708.
Winrow, Andrew (2009). "Defender of the Realm: The Life and Work of Lieutenant Colonel Adrian Grant Duff, 1869-1914". Journal of the Society for Army Historical Research. 87: 307. JSTOR44231708.