J.-M. Henckaerts and L. Doswald-Beck, Customary International Humanitarian Law, Vol. I: Rules, 2005, p. 161, chap. 15 ([Internet, 2025-07-23](https://www.icrc.org/sites/default/files/external/doc/en/assets/files/other/customary-international-humanitarian-law-i-icrc-eng.pdf))