ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section II : On the armed force of belligerent states - Art. 9.
Art. 9. The conversion of a vessel into a war-ship may be accomplished by a belligerent only in its own waters, in those of an allied State also a belligerent, in those of the adversary, or, lastly, in those of a territory occupied by the troops of one of these States.