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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section V : On the rights and duties of the belligerent with regard to individuals - Art. 62.
Art. 62. B. Passengers. When individuals who follow a naval force without belonging to it, such as contractors, newspaper correspondents, etc., fall into the enemy's hands, and when the latter thinks it expedient to detain them, they may be detained only so long as military exigencies require. They are entitled to be treated as prisoners of war.