Messimer, D. R. (2015). The Baltimore Sabotage Cell: German agents, American traitors, and the U-boat Deutschland during World War I. Naval Institute Press.

Messimer, Dwight R. The Baltimore Sabotage Cell: German Agents, American Traitors, and the U-boat Deutschland During World War I. Annapolis, Maryland: Naval Institute Press, 2015.

Messimer, Dwight R. The Baltimore Sabotage Cell: German Agents, American Traitors, and the U-boat Deutschland During World War I. Naval Institute Press, 2015.