What has the author Robert Ackrill written?

Robert Knuckle has written:

'The flying bandit' -- subject(s): Bank robberies, Biography, Jewel thieves

'Molly Of The Mounties'

'Beyond Reason' -- subject(s): Fugitives from justice, Police murders, Royal Canadian Mounted Police

'In the line of duty' -- subject(s): History, Police murders, Royal Canadian Mounted Police