Paul Lund, Harry Ludlam: The Night of the U-Boats (1973) ISBN 0-572-00828-7
Roskill, S. W. (1957) [1954]. Butler, J. R. M, ed. War at Sea. History of the Second World War United Kingdom Military Series. I (4th impr. ed.). *London: HMSO. OCLC 881709135.