The Text
There shall be for any State that requires it a Customary Court of Appeal for that State.
Source · Constitution of the Federal Republic of Nigeria, 1999, as amended · §280
All sections in Chapter VII — The Judicature
Methodology
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Redline
Wikipedia is never a source.