The Right to non-discrimination on grounds of race and ethnicity is explained in these documents:

Legally Obligating Documents
African (Banjul) Charter on Human and People's Rights (2, 3)
Convention on the Rights of the Child (2(1))
International Convention on Elimination of All Forms of Racial Discrimination (1, 2, 3)
International Covenant Economic, Social and Cultural Rights (2(2))
International Covenant on Civil and Political Rights (2(1))