ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(f) Spies - Art. 23.
Art. 23. Individuals captured as spies cannot demand to be treated as prisoners of war.
' But '
[See article 24