Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section III : On means of injuring the enemy - Art. 29.
Art. 29. If the military situation permits, the commander of the attacking naval force, before commencing the bombardment, must do his utmost to warn the authorities.