Sources of IHL

As a part of Public international law, IHL rules can be found in agreements and customary law. The basis of IHL is contained in the four Geneva Conventions of 1949 and their Additional Protocols of 1977 and the Hague Conventions of 1899 and 1907. The former treaties elucidate important principles of IHL and focus on rights and protection of those affected by armed conflicts, such as civilians, prisoners of war, and wounded and sick combatants. The latter focus on means and methods of warfare, that is, they aim to prohibit certain types of weapons and military tactics.

Here you can find the original text of those conventions.