Convention (IV) respecting the Laws and Customs of War on Land and its annex: Regulations concerning the Laws and Customs of War on Land. The Hague, 18 October 1907.
ANNEX TO THE CONVENTION : Regulations respecting the laws and customs of war on land #Section III : Military authority over the territory of the hostile state
Art. 44. A belligerent is forbidden to force the inhabitants of territory occupied by it to furnish information about the army of the other belligerent, or about its means of defense.