ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Draft International Convention on the Condition and Protection of Civilians of enemy nationality who are on territory belonging to or occupied by a belligerent. Tokyo, 1934.
Chapter IV#Section III: Final provisions - Art. 31.
Article 31.- A state of war shall give immediate effect to the ratifications deposited and accessions notified by the belligerent Powers before or after the beginning of hostilities. The Swiss Federal Council shall communicate by the quickest method any ratifications or accessions received from belligerent Powers.