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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
Part II: Rules of Air Warfare#Chapter VII: Search, capture and confiscation. - Art. 54.
Art. 54. The papers of a private aircraft shall be considered insufficient or irregular if they do not establish the nationality of the aircraft and if they do not show the names and the nationality of each of the members of the crew and of the passengers, the point of departure and the destination of the flight, as well as precisions concerning the cargo and the condition on which it is conveyed. The books of the aircraft are included therein,