Relevant ICESCR Articles:

07(a)(1): The States Parties to the present Covenant recognize the right of everyone to the enjoyment of just and favourable conditions of work which ensure, in particular:
(a)Remuneration which provides all workers, as a minimum, with:
(i)Fair wages and equal remuneration for work of equal value without distinction of any kind, in particular women being guaranteed conditions of work not inferior to those enjoyed by men, with equal pay for equal work;

Related Documents:

Additional Protocol to the American Convention on Human Rights in the Area of Economic, Social and Cultural Rights; "Protocol of San Salvador"

African [Banjul] Charter on Human and Peoples' Rights

Universal Declaration of Human Rights